Care specifications
| Type | Crab |
|---|---|
| Difficulty | Easy |
| Max size | 1 in |
| Lifespan | 1–3 years |
| Temperature | 72–78 °F |
| pH | 6.8–7.8 |
| General hardness | 6–15 dGH |
| Calcium needs | High |
| Minimum tank size | 5 gallons |
| Diet | Detritus, Biofilm, Leftover fish food, Sinking pellets, Bloodworms |
| Roles | Scavenger, Showpiece |
| Plant safe | Yes |
| Betta compatible | With caution |
| Breeds in freshwater | No |
| Population growth | None |
| Temperament | Peaceful |
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Frequently asked questions
Will a pom pom crab hurt my shrimp or fish?
It is the most trustworthy crab in the hobby — too small and too busy filter-sweeping detritus to hunt. Sleeping fish and shrimplets are theoretically at risk from any crab, but reports of actual aggression are rare; most keepers run them in shrimp colonies without losses.
Does a pom pom crab need land like other crabs?
No — this is the exception. Ptychognathus barbatus lives fully submerged and does not need a beach or floating platform, though it appreciates hardscape that reaches near the surface. It cannot breed in captivity (larvae need brackish water), so your population stays whatever you stock.
Pom Pom Crab appears in
Plants that pair well with Pom Pom Crab
Planting the same tank?
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