Tank Setup: The aquarium architecture MUST accommodate their minuscule size and profound need for absolute security. A minimum 40-liter (10-gallon) marine nano-reef is highly recommended.
CRITICAL REQUIREMENT: They MUST NOT be placed in massive, 150+ gallon tanks, as they will disappear into the rockwork and never be seen again. The tank MUST be aquascaped with small, loose coral rubble and highly porous live rock. They prefer low-flow areas where they can safely sweep their anemones without being blown away.
Diet and Feeding: They are omnivorous scavengers that rely entirely on their anemones to gather food. In the aquarium, they are generally easy to feed, provided the food is small enough. They MUST be actively target-fed 2-3 times a week, especially in small, sterile nano-tanks. Gently squirt frozen Mysis shrimp, Cyclop-eeze, or crushed carnivore pellets near their hiding spot.
FASCINATING FACT: If they lose one anemone, they will rip their remaining anemone in half; both halves will regrow into complete clones.
Water Quality: As delicate marine invertebrates, they are devastatingly sensitive to water chemistry fluctuations. They demand stable tropical heat (24-27°C / 75-81°F). Specific gravity (salinity) MUST be maintained precisely between 1.023 and 1.025. They require hard, highly alkaline water (pH 8.1 - 8.4) with flawless Calcium (400-450 ppm) and Magnesium to ensure successful molting. Rapid changes in salinity or pH during acclimation will cause instantaneous, lethal osmotic shock.
Compatibility and Tankmates: Compatibility requires absolute vigilance regarding predatory fish and even large peaceful fish. They are 100% reef-safe.
CRITICAL WARNING: Because they are so incredibly tiny, they are universally viewed as a snack. They WILL be rapidly hunted and eaten by Triggerfish, Wrasses (even small Six-Lines), Hawkfish, large Angelfish, and Dottybacks. They MUST be housed exclusively with incredibly small, peaceful nano-fish (tiny Gobies, small Blennies, Clownfish).
Aquarium Breeding: Breeding the Pom Pom Crab in captivity is an unsolved challenge for home aquarists. In a peaceful nano-tank, a male and female will readily mate. The female will carry a large, bright red or orange mass of eggs securely tucked under her abdominal flap for several weeks. She releases thousands of microscopic, pelagic larvae (zoea) into the water column at night. Rearing these tiny larvae through their complex planktonic stages requires specialized rotifer cultures and is practically impossible at home.
Risks and Diseases:
CRITICAL TOXICITY WARNING: Like all crabs, they are immediately and fatally hypersensitive to COPPER (Cu) and heavy metals. They will die instantly in tanks treated with copper medications. The second major risk is lethal predation; placing a Pom Pom Crab in a tank with a Coris Wrasse or Hawkfish is an immediate death sentence. The third risk is death during the molting process due to low Calcium or Iodine levels, leaving them trapped in their exoskeleton.