Pom Pom Crab
Ptychognathus barbatus
Pom Pom Crab (Ptychognathus barbatus) — Easy care, Peaceful, under Other. Minimum tank in the app: 5.3 US gal min; aim for 72–82°F and pH 6.5–8. The Pom Pom Crab is an engaging addition for aquarists seeking a low-maintenance, peaceful scavenger that thrives in small groups.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
Various
We don’t shade a region on this simplified map—your text may be Europe-only, worldwide, listed as “Various,” captive-only, or outside the five areas used in the stocking calculator. That tool still scores whether your fish come from similar parts of the world.
Regional colours match the stocking calculator’s origin map.
Pom Pom Crab Tank Setup
Create a balanced environment with plenty of hiding spots, such as caves or dense vegetation, while ensuring open surfaces for scavenging. A sandy or soft substrate is ideal as it allows for natural foraging behaviours, and moderate flow mimics their natural habitat, complementing subdued lighting to reduce stress.
What Do Pom Pom Crabs Eat?
These crabs are opportunistic feeders, benefiting from a varied diet that includes sinking pellets, algae wafers, and detritus. Feeding should be spaced out to reduce competition, as they can be slow feeders, and ensure that food reaches the substrate where they forage.
Pom Pom Crab Tank Mates
Pom Pom Crabs coexist well with small, non-aggressive tank mates that occupy different levels of the aquarium. Look for species that are similarly sized and peaceful, such as certain tetras or rasboras. Avoid larger or faster fish that may outcompete them for food or intimidate them, and maintain a minimum group of three to foster a secure social structure.
Are Pom Pom Crabs Good for Beginners?
In App-aquatic we file this under easy care. That still means a cycled tank, realistic stocking, and parameters that do not swing every weekend. Aquarists often underestimate the need for adequate cover and social structures, leading to stress and reduced activity in crabs. neglecting water quality—especially copper levels—can result in health issues, as they are sensitive to certain medications and chemicals.
Building a community? Run the full list through the stocking calculator before you add anything else.
Log tests and reminders in App-aquatic—free, same data you see here.




