The fish you bought is probably not the fish on the label
Almost every kuhli loach sold in the hobby is traded as Pangio kuhlii. According to the reference source for this genus, almost none of them are.
Seriously Fish records Pangio semicincta as among the most frequently misidentified species in the hobby, almost always being traded as P. kuhlii. It goes further: P. kuhlii is endemic to Java and has possibly never been seen in aquaria. Aquarium Co-Op, writing the same care guide most people read, says Pangio kuhlii is the most common type.
This record carries Pangio semicincta, because the taxonomic claim is specific, sourced and testable, while the other is a name in general use. It changes nothing about the tank. It changes what you should trust on a label, and it is the reason the rest of this page quotes a species page rather than a genus habit.
The practical version: the numbers below are the same either way. Both fish are 70 to 100 mm burrowing loaches from the same genus with the same recorded water, so a mislabelled bag is not a husbandry problem. It is only a problem when someone tells you the care figures differ by species, because on our sources they do not.
Seriously Fish
Among the most frequently-misidentified in the hobby, almost always being traded as P. kuhlii. P. kuhlii is endemic to Java and has possibly never been seen in aquaria.
Aquarium Co-Op
Pangio kuhlii is the most common type.
It digs, and then it disappears
This is the one behavior that decides whether you enjoy the fish, and both sources ask for the same thing to support it. Seriously Fish: use a soft, sandy substrate, since this species likes to dig and tends to spend some of its time completely buried. Aquarium Co-Op: a smooth substrate that is safe to dig in.
Do kuhli loaches burrow?
They are freshwater loaches in the family Cobitidae, found across shallow slow water in southeast Asia, and the answer is the whole reason they are kept.
Yes. The phrase on the record is completely buried. Not tucked under a rock, not resting behind the filter: under the sand, out of sight, for part of the day. A tank floored in sharp gravel gives them nowhere to do it, and a keeper who buys six and sees one is usually looking at a substrate problem rather than a missing fish.
Which is also why the group matters more here than it looks. Seriously Fish asks for at least five to six specimens as the minimum purchased; Aquarium Co-Op says at least three to six. Groups of six keep some of the fish out where you can see them. Groups of two can both be buried at once, and the tank looks empty for days.
Kuhli loach behavior, and what it is not
Seriously Fish describes Pangio species as peaceful both with one another and other fishes, with one caveat: they may prey on eggs or fry. Aquarium Co-Op describes them scavenging for food at the bottom of the aquarium. Neither of those two care sources uses the word nocturnal; Wikipedia does, calling the species very slender and nocturnal. So the record holds what the care sources state, a fish that spends part of its day buried, and reports the third claim rather than adopting or hiding it. Buried at noon and active at dusk are different explanations for the same empty tank.
On kuhli loach bioload, neither source publishes a figure. What they publish instead is a tank size and a group size, and those are the numbers this record will hold you to.
The numbers, as water
The pH and hardness rows below are one source deep, because only one of our two sources publishes a figure for them. The temperature row is where they disagree, and the bright water is the part they share.
Seriously Fish records 21 to 26 °C, which is 70 to 79 °F. Aquarium Co-Op records 74 to 80 °F. The overlap is five degrees wide and that is what we hold.
Seriously Fish. The bottom of that range is not a target, it is a blackwater tolerance; Aquarium Co-Op says only that they live in a wide range and gives no figure.
Seriously Fish. A ceiling of 143 ppm is soft to moderately soft water, and it is the tightest requirement on this page.
| Field | Kuhli | Black kuhli |
|---|---|---|
| Species | P. semicincta | P. oblonga |
| Also sold as | P. kuhlii, which our source says is not this fish | Java loach, cinnamon loach, chocolate kuhli loach |
| Adult size | 90 to 100 mm | 70 to 80 mm |
| Base, as stated | at least 60 by 30 cm | at least 60 by 30 cm |
| Temperature | 70 to 79 °F | 70 to 79 °F |
| pH | 3.5 to 7.0 | 3.5 to 7.0 |
| Hardness | 0 to 143 ppm | 0 to 143 ppm |
| Group | at least 5 to 6 | at least 5 to 6 |
| Lifespan | not recorded | not recorded |
Read down the two columns and the useful conclusion is that they are the same record. Every water figure, the base measurement, the group and the substrate are identical on both species pages; what differs is length and color. Aquarium Co-Op names a third, Pangio anguillaris, the silver kuhli, which we have not read a species page for and have therefore left out of the table.
Seriously Fish also flags that the black kuhli may be more than one fish: the images on its page may represent more than one species, and molecular work suggests a complex of closely related taxa with at least four genetic lineages. So the honest summary of types of kuhli loaches is that the trade sells at least three, the science is unsettled about one of them, and the care does not change.
| Field | Seriously Fish | Aquarium Co-Op | aqua-fish |
|---|---|---|---|
| Temperature | 70 to 79 °F | 74 to 80 °F | 75 to 86 °F |
| pH | 3.5 to 7.0 | wide range, no figure | 6.5 to 7.0 |
| Hardness | 0 to 143 ppm | wide range, no figure | 143 to 214 ppm |
| Minimum tank | 60 by 30 cm base | 20 gal for 3 to 6 | 20 gal |
| Group size | shoaling, no number | 3 to 6 | at least 5 or 6 |
| Adult size | 90 to 100 mm | 3 to 4 in | 70 to 100 mm |
| Lifespan | not stated | not stated | up to 10 years |
The wild water and the aquarium water are not the same water
Read the hardness row twice. Our figure comes from a species profile describing where the animal lives: 0 to 143 ppm, soft to the point of nothing. aqua-fish, writing about a glass box, gives 143 to 214 ppm. The two ranges meet at a single point and share nothing else. pH does the same thing, 3.5 to 7.0 against 6.5 to 7.0, and temperature runs 70 to 79 against 75 to 86.
There is a reason behind all three, and it is not that somebody is wrong. A species profile records a blackwater stream in Borneo. A care guide records what keepers actually hold and what the fish survives in. Our corydoras record found two sources making the same distinction explicitly, splitting their figures into captive bred and wild caught, and this record is the same problem with nobody labeling it.
- What the record prints stays put. The species profile is the closer measurement of the animal, and this site transcribes fields rather than averaging them.
- What the disagreement is telling you is that the tightest requirement on this record is the least settled one. Our own note calls hardness the field least likely to be checked. It is also the field with the widest disagreement.
- What it means for tap water. If yours is hard, one source says you are inside the range and the other says you are three times over it. Nothing here supports adjusting hardness for this fish, and everything supports not moving it once the group is in.
- Where the agreement is: the tank. Two sources say 20 gallons independently, and Seriously Fish's 60 by 30 centimeter base is what a 20 gallon long provides.
aqua-fish adds the sentence all three imply and none of the others writes down: this is a fish highly sensitive to water quality and to sudden changes in temperature and chemistry. On a record whose parameters disagree this much, stability is the instruction that survives the disagreement.
Plants, and the hiding places they are actually for
This record described a fish that spends part of the day buried and never once said the word plants, which is a gap rather than a style choice. Two sources fix it and both name species.
Aquarium Co-Op states the kuhli loach is safe to keep in a planted tank and will not consume algae or aquarium plants, recommends anubias roots and java moss as habitat, and asks for plenty of hiding spots and aquarium plants. aqua-fish asks for dense vegetation, caves and driftwood, and names anubias, java fern, cryptocoryne wendtii and amazon sword.
- Anubias appears on both lists, which is the only plant two of our sources name for the same fish anywhere on this site.
- Plants are not food here. Aquarium Co-Op is explicit that this fish eats neither algae nor plants, so a planted tank costs nothing and buys cover.
- Cover is the requirement, planting is one way to supply it. Caves and driftwood are named alongside vegetation, and the substrate matters more than either: sand it can bury itself in.
- What we hold on the plants themselves is in the aquarium plants silo, and none of it is recorded as a kuhli loach requirement, because no source states one as a requirement.
The full record
| Field | Recorded | Where it comes from |
|---|---|---|
| Minimum tank | 20 gal | Aquarium Co-Op, for a group of three to six. Seriously Fish asks for base measurements of at least 60 by 30 cm, which a 20 long clears with length to spare. aqua-fish states 80 liters, 20 gallons, independently, which makes the tank the one field every source that gives a figure agrees on. |
| Temperature | 74 to 79 °F | The overlap. Seriously Fish records 21 to 26 °C, which is 70 to 79 °F; Aquarium Co-Op records 74 to 80 °F. aqua-fish runs much warmer, 24 to 30 degrees, which is 75 to 86 F, so the three sources overlap only between 75 and 79. |
| pH | 3.5 to 7.0 | Seriously Fish. The floor of that range is a blackwater tolerance rather than a target. Aquarium Co-Op states a wide range without giving figures. aqua-fish is far tighter at 6.5 to 7.0, which is the aquarium figure against a blackwater one. |
| Hardness | 0 to 143 ppm | Seriously Fish, as the wild habitat figure. It is the tightest requirement on this record and the one least likely to be checked, and it is also the least settled: aqua-fish gives 8 to 12 degrees, about 143 to 214 ppm, for an aquarium. The two ranges meet at one point and share nothing else. A species profile measures a stream and a care guide measures practice; the profile figure is what this field prints. |
| Adult size | 3.5 to 3.9 in (90 to 100 mm) | Seriously Fish, as standard length. Aquarium Co-Op agrees at three to four inches. |
| Diet | Micropredator, sinking | Seriously Fish calls it chiefly a micropredator; Aquarium Co-Op names sinking pellets, gel food, frozen bloodworm and live blackworm. One list, two labels. The Aquarium Co-Op care guide names Xtreme Nano Pellets and Repashy Community Plus specifically, and aqua-fish adds brine shrimp and daphnia. |
| Water column | Bottom, and buried | Seriously Fish: likes to dig and tends to spend some of its time completely buried. Neither care source calls the species nocturnal; Wikipedia does, and the record prints both rather than choosing. |
| Lifespan | Up to 10 years | aqua-fish, as up to ten years in a well maintained aquarium, and the only source we hold that states one. Neither Seriously Fish species profile gives a figure and neither does Aquarium Co-Op. Treat it as one source rather than a consensus. |
| Growth rate | Mature at 2.75 in of a 4 in maximum | Wikipedia is the only one of the five with a figure, and it is a stage rather than a rate: kuhli loaches reach maturity at 2 3/4 inches, 7 cm, against a maximum length of 4 inches. So the animal is adult at about two thirds of its final length, which is the useful part for anybody wondering whether a 3 in fish is still growing. Neither Seriously Fish profile states a rate, on Pangio semicincta or on Pangio oblonga, and neither does Aquarium Co-Op or aqua-fish. |
The same nine fields for every animal on this site are in the A to Z index.
Where our sources disagree
Our two sources name this fish differently, and one of them says the other's name belongs to a species that is not in the hobby at all. It is the only record on this site where the disagreement is about what the animal is.
Seriously Fish
Among the most frequently-misidentified in the hobby, almost always being traded as P. kuhlii. P. kuhlii is endemic to Java and has possibly never been seen in aquaria.
Aquarium Co-Op
Pangio kuhlii is the most common type.
What we record: we record Pangio semicincta and keep kuhli loach as the title, because that is what the fish is sold as and searched for. One claim is specific and checkable, the other repeats trade usage, and where a reference source contradicts common usage on identification we follow the reference source. Nothing about the care changes: both species in the table share every recorded figure.
The floor, and under it
Most bottom dwellers occupy the bottom. Kuhli loaches occupy the bottom and the layer below it, which is a stocking advantage and a viewing disadvantage at the same time. An eel shaped fish in the family Cobitidae is built for exactly that: into the sand rather than along it.
The second occupied row is the one that surprises people. A tank can hold a surface fish, a mid water school and a kuhli loach group without any two species meeting, which is why this fish appears in so many stocking plans. It is also why the substrate is not a decorating choice: it is one of the four layers, and this species lives in it.
Kuhli loach diet, and the one number nobody states
Seriously Fish calls this fish chiefly a micropredator and asks for regular meals of live and frozen Daphnia, Artemia, bloodworm, micro worm and grindal worm. Aquarium Co-Op names sinking foods: community pellets, Repashy gel food, frozen bloodworms and live blackworms. Between them that is one shopping list with two labels on it, and every item either sinks or is offered small.
How often to feed kuhli loaches
Neither source states a frequency. Seriously Fish says regular meals and Aquarium Co-Op does not address it at all, so this record does not publish a schedule. What both make clear is the mechanism: the food has to reach the floor, and in a community tank the fish above will try to stop it.
The scavenger misunderstanding
Aquarium Co-Op describes them scavenging for food at the bottom of the aquarium. That describes where they eat, not whether they need feeding. A tank where leftovers are the plan is a tank where a micropredator is on rations, and neither of our sources offers this fish as a cleaning service.
A source names this fish as a tank mate for a record our own rows will not pair it with. Aquarium Source lists the kuhli loach among eight companions for the clown loach, and the two temperature rows do not meet: this record stops at 79 °F and that one prints 82, the single figure its five sources all allow. Our tank mates grid therefore shows no overlap for the pairing while a source we cite recommends it. That is the disagreement worth knowing about, not a error on either side: a tank mate list is written from temperament and size, and the grid on this site is built from published water. The two loaches also answer the same question in opposite ways, since Aquarium Co-Op says this species is not known for eating snails and four sources say the clown loach is.
What a starter tank leaves out
Three things this record asks for that a tank sold with gravel in the box does not include.
- Soft sandso it can bury
- Small sinking foodmicropredator
- Three more of themfive to six
Every item our records ask for is gathered on the tank setup topic.
Nothing here is a paid link. It is the shortfall between what this record asks for and what a boxed kit contains.
How this record was compiled
- By
- Verified
- Sources
Seriously Fish, Pangio semicincta, Aquarium Co-Op, Seriously Fish, Pangio oblonga, Wikipedia, kuhli loach and aqua-fish
- Conflicts
Printed above rather than resolved quietly
- Not recorded
Lifespan, growth rate, feeding frequency, bioload, and the albino variety, which none of our sources describes
Do kuhli loaches eat snails? One of our sources answers it directly, and the answer is no.
Company for a fish that competes with nobody
Seriously Fish states the temperament for the genus: Pangio species are peaceful both with one another and other fishes. Aquarium Co-Op names the company: tetras, rasboras and even betta fish. The verdicts below say which source each rests on.
Kuhli loach and betta
Tetras, rasboras, and even betta fish.
What goes wrong, in order of frequency
Sharp gravel
Both sources ask for a substrate this fish can dig in, and one of them specifies soft sand. On gravel the behavior both pages describe, spending part of the day completely buried, is simply unavailable.
Two or three fish
Seriously Fish sets the minimum purchase at five to six. Aquarium Co-Op will accept three. Buy at the higher number and the tank has visible loaches in it; buy at the lower one and you have bought a rumor.
Bought for snails
Not known for eating snails, in as many words. This is a fish sold to solve a problem it is documented not to solve.
Hard water
The recorded ceiling is 143 ppm, which is the tightest figure on this page and the one least likely to be checked. In genuinely hard tap water this is the species requirement that will not negotiate.
Fed from above
A micropredator on the floor of a community tank gets what the mid water fish miss. Sinking food, after the others have eaten, is the whole fix.
Questions about kuhli loach care
What is the kuhli loach lifespan?
One of our five sources states a figure: aqua-fish gives up to ten years in a well maintained aquarium. Neither Seriously Fish species profile states one, and neither does Aquarium Co-Op.
Ten years is a long time for a fish sold as an oddball beginner species, and it is the second longest figure on this site after the corydoras. Read it alongside the group requirement: five or six animals, for a decade, is the actual commitment.
Do kuhli loaches need a planted tank?
Not as a requirement, and two sources recommend it and name plants. Aquarium Co-Op states they are safe in a planted tank, will not consume algae or aquarium plants, and asks for plenty of hiding spots and aquarium plants, naming anubias roots and java moss. aqua-fish asks for dense vegetation, caves and driftwood, and names anubias, java fern, cryptocoryne wendtii and amazon sword.
Anubias is on both lists. What the plants are for is cover rather than food, and the substrate matters more than either: this fish buries itself, and sand is what lets it.
What water hardness does kuhli loach care need?
Our sources barely agree at all, and this is the widest disagreement on the record. Seriously Fish gives 0 to 143 ppm for the wild habitat. aqua-fish gives 143 to 214 ppm for an aquarium. The two ranges meet at one point.
The record prints the species profile figure, because a profile measures the animal and a care guide measures practice. What both imply and only aqua-fish writes down is that this fish is highly sensitive to sudden changes in chemistry, so whichever end you are at, the instruction is not to move it.
How many kuhli loaches should you keep together?
Five or six as a minimum on this record. Aquarium Co-Op says three to six and aqua-fish says at least five or six, so the record takes the higher floor. Seriously Fish calls the genus shoaling without giving a number.
The reason the higher figure wins here is what happens below it: a group too small stays buried, and a fish you never see is not a fish you can check on. The stocking calculator prints 5 to 6 against the 20 gallon minimum for exactly that reason.
Do kuhli loaches eat snails?
No. Will a kuhli loach eat snails given the chance? Aquarium Co-Op states they are not known for eating snails. If a shop tells you a kuhli loach will clear a snail population, that is the shop talking rather than either source we hold. For a snail problem the honest first step is feeding less, not buying a fish.
What is the kuhli loach tank size?
Twenty gallons. Aquarium Co-Op asks for a 20 gallon or larger for a group of three to six. Seriously Fish asks for base measurements of at least 60 by 30 cm, and a standard 20 long is 76 by 30 cm, so it clears the stated base with length to spare. Nothing smaller is supported by either source for a group.
What is the kuhli loach diet?
Small live and frozen foods plus sinking prepared food. Seriously Fish calls it chiefly a micropredator and names live and frozen Daphnia, Artemia, bloodworm, micro worm and grindal worm; Aquarium Co-Op names community pellets, Repashy gel food, frozen bloodworms and live blackworms. Everything on both lists reaches the floor.
How often to feed kuhli loaches?
Not recorded. Seriously Fish asks for regular meals without setting a frequency and Aquarium Co-Op does not address it, so this record does not publish a schedule. What is stated is that the food has to sink and has to be small.
Do kuhli loaches burrow?
Yes, and the source wording is stronger than burrow: this species likes to dig and tends to spend some of its time completely buried. That requires soft sand. Aquarium Co-Op asks for a smooth substrate that is safe to dig in, which is the same requirement in gentler language.
Can you keep a kuhli loach and betta together?
Aquarium Co-Op names betta fish among the tank mates, so the pairing has a source behind it. Two conditions come from this page rather than that one: the tank has to be the 20 gallon sand floored kuhli setup first, and our betta record prints a source that recommends against community tanks at all. Build the loach tank, then consider the betta.
Are kuhli loach and shrimp safe together?
Adults, yes, on one source: Aquarium Co-Op states they are not known for eating shrimp. Fry are a different question and an open one, because Seriously Fish notes that Pangio species may prey on eggs or fry without saying whose.
What are the types of kuhli loaches?
Our sources name three: the standard kuhli, which Seriously Fish records as Pangio semicincta; the black kuhli, Pangio oblonga, also sold as Java, cinnamon or chocolate kuhli; and the silver kuhli, Pangio anguillaris, which Aquarium Co-Op names and we have not read a species page for. The two we have figures for share every care number and differ only in size and color.
Is there an albino kuhli loach?
Not on our sources. Aquarium Co-Op describes standard, black and silver varieties and notes no albino; Seriously Fish does not mention one either. Fish are sold under that name, so the honest answer is that we have no source for what they are, and this record will not describe a variety it cannot cite.
What is the kuhli loach natural habitat?
Seriously Fish records shallow, slow-moving sections of forest streams, and other calm habitats such as swamps, oxbows and backwaters. Slow and shallow is the useful part: nothing about that habitat suggests the strong flow a large filter produces in a 20 gallon tank.
What is the kuhli loach bioload?
Not recorded. Neither source publishes a bioload figure for this species, and any number you find elsewhere is somebody arithmetic on somebody else's estimate. What our sources do state is a 20 gallon minimum for a group of three to six, and that figure already contains their answer.
What is normal kuhli loach behavior?
Peaceful with one another and with other fishes, per Seriously Fish, scavenging along the bottom, per Aquarium Co-Op, and buried in the sand for part of the day. On nocturnal our sources split: Wikipedia calls the species nocturnal, while neither care source uses the word. Both explanations predict the same thing, which is a tank that looks empty in the afternoon.
How long do kuhli loaches live?
Not recorded. Neither source states a lifespan, on the genus guide or on either of the two species pages behind the table above.
Is the kuhli loach really Pangio kuhlii?
Probably not. Seriously Fish records Pangio semicincta as almost always traded as P. kuhlii, and states that P. kuhlii is endemic to Java and has possibly never been seen in aquaria. Aquarium Co-Op calls P. kuhlii the most common type. We record P. semicincta and print both claims.
Where it comes from, and what that argues for
Seriously Fish places this species in shallow, slow-moving sections of forest streams, and in calm habitats such as swamps, oxbows and backwaters. Every word of that is a tank instruction if you read it as one: shallow, slow, calm, and shaded enough to be a forest stream rather than an open one.
It is also the argument for the pH figure that looks alarming out of context. A recorded tolerance down to pH 3.5 is not a target to chase, it is what a blackwater habitat can do to water that sits over decaying leaves. The same reading explains the hardness ceiling of 143 ppm: soft water is the habitat, not a preference.
The range is wider than the identification story implies. Wikipedia records the trade fish as found in Malaysia, Sumatra, Thailand and across the Sunda shelf excluding Sarawak, while P. kuhlii proper is given from the island of Java. Two ranges, one bag label, and the fish in front of you is almost certainly from the wider one.
None of this asks for a biotope tank. It asks for gentle flow, soft sand and shade, which is three cheap decisions rather than a project.
Habitat, as stated
- Water
- Shallow and slow-moving
- Setting
- Forest streams, swamps, oxbows, backwaters
- Reads as
- Gentle flow, soft substrate, shade
- Not stated
- Anything about lighting, leaf litter or seasonal change, so we do not prescribe them
The distribution note on the same page is what makes the identification section above matter: P. kuhlii is endemic to Java, while the fish in the trade is recorded from elsewhere. Two names, two ranges, one label on the bag.
What it looks like, and whether you can sex it
An eel shaped body with slightly compressed sides, four pairs of barbels around the mouth and very small fins. Wikipedia records 10 to 15 dark brown to black vertical bars along the body with salmon pink to yellow gaps between them, and one detail worth knowing before you go looking for its eyes: they are covered with transparent skin. Maximum length there is given as 4 inches, or 10 cm, which agrees with the 90 to 100 mm standard length on the species page this record follows.
The bars are what you count when a shop has two species of loach in one tank. A black kuhli, Pangio oblonga, has no body markings at all; the giant kuhli and the standard kuhli are separated on their own pages by a mark at the caudal fin base rather than by size. If your fish has bars along its body and a pale ground color between them, the table above is the right column.
Sexing, and the breeding reality
Wikipedia gives the only sexing detail our sources offer, and it is in the fins: males carry one hard ray in the pectoral fins with 7 to 8 weak rays, females have no hard ray and 8 to 10 weak ones, and females often become larger than males in breeding condition. A fin ray count on a fish that buries itself is a description rather than a technique, so treat it as one.
On breeding, the same source is blunt in a way that is useful: it needs plenty of hiding places and consistent water quality, it can prove a challenge if conditions are not perfect, and most successful attempts have used hormone injections to induce spawning. This is not a fish that breeds by accident in a community tank, and nothing in our care sources contradicts that.
Names, old and current
- Described as
- Pangio kuhlii, van Hasselt, 1823
- Formerly
- Acanthophthalmus kuhlii. Tanks and price lists still carry Acanthophthalmus, decades after the genus moved
- Family and order
- Cobitidae, in Cypriniformes
- In the trade
- Primarily Pangio semicincta, sold under the same name
- Also sold as
- Coolie loach, leopard eel, and by variety: black, silver, giant
Three sources, three levels of confidence. The genus and family are settled; the species on the label is not; and the fish in the tank is the same animal whichever of those three names it arrived under. That is the whole of the identification problem and it fits in a sentence.