The care records, in full
This silo is two records old and it exists because the keyword map asked for it. Everything else on this site is fresh water, and adding salt water meant changing more than the content: the row every freshwater record fills with hardness carries specific gravity here, and the pairings grid was patched so that a marine record is refused against a freshwater one before any temperature is compared. A shared band between a damselfish and a betta is a misleading number rather than an incomplete one, and this site does not print those.
Two records is one short of the three this site requires before it will let a silo be indexed, so the page you are reading is marked noindex and both records on it are not. That is the rule working rather than a gap, and it corrects itself when a third record lands.
Every field, and every source
The whole silo, in the nine fields every species on this site carries. Read the hardness row first, because it is the one that is not what it says: on a freshwater record it is dissolved calcium and magnesium in parts per million, and here it is specific gravity. That substitution is flagged on both records rather than left quiet.
| Field | Damselfish | Mandarin goby |
|---|---|---|
| Minimum tank | 30 gal | 30 gal |
| Temperature | 73 to 81 °F | 76 to 82 °F |
| pH | 8.1 to 8.4 | 8.1 to 8.4 |
| Hardness | Specific gravity 1.020 to 1.025 | Specific gravity 1.025 |
| Adult size | 3 in, and 12 for the largest in the family | 2.4 to 3 in |
| Diet | Omnivore, and it will eat almost anything | Live copepods, almost exclusively |
| Water column | Around rock, and it defends a corner of it | The bottom, and it walks on it |
| Lifespan | 5 to 6 years | 2 to 4 years |
| Growth rate | not recorded | not recorded |
What the two have in common
Both publish a pH of 8.1 to 8.4, which is the highest pH floor on this site and four tenths of a point above the ceiling of every freshwater record except two. Both sit at 30 gallons. Both are small, at three inches or under. And both are refused against all forty six freshwater records here by the same single fact.
And where they part
On difficulty, completely. Our damselfish record is a fish one source calls easy to add and nearly impossible to remove, and the problem is temperament. Our mandarin goby record is a peaceful, reef-safe fish that eats one copepod every 5 to 10 seconds and cannot be fed from a jar, and the problem is infrastructure. One should be added last and the other should not be added for a year.
The shared band, and what is not written here yet
Two records overlap from 76 to 81 °F, and the salinity meets at a single value, 1.025, because one record publishes a range ending there and the other publishes that figure alone. So the two fish on this silo can share water and, on the temperament rows, should not share a tank. Our tank mates grid prints the overlap and the caution separately.