Pom Pom Crab

Pom Pom Crabs are one of the most unique and entertaining ornamental crabs available for saltwater aquariums due to their small size, peaceful nature, and unusual habit of carrying tiny anemones in their claws. Also known as Boxer Crabs, Lybia tessellata use these anemones for defense and food capture, holding them like miniature pom poms as they move through the aquarium. Their fascinating behavior, reef safe nature, and compact size make them excellent additions to nano reefs, peaceful community aquariums, and mature reef systems with plenty of live rock and hiding places.

Introduction to Pom Pom Crab (Anemone-Carrying Boxer Crab & Nano Reef Favorite)

Pom Pom Crabs (Lybia tessellata) are small ornamental crabs known for their distinctive partnership with tiny anemones, which they hold in their claws and wave defensively when threatened. In the wild, they are often found in reef rubble, sandy areas, coral zones, and rocky crevices where their small size and patterned body help them stay hidden from predators. In the aquarium, they may be shy at first, spending much of their time under ledges, inside rockwork, or in shaded areas, but patient hobbyists are rewarded with one of the most interesting behaviors found in reef-safe crabs.

Care Requirements

Care Level: Easy – Hardy when kept in stable, established aquariums
Minimum Tank Size: 10+ gallons
Aquarium Setup: Requires live rock, caves, crevices, rubble zones, and peaceful tankmates

Pom Pom Crabs do best in mature saltwater aquariums with stable water quality and plenty of hiding places. They are small and can be secretive, so nano aquariums or peaceful reef tanks often make it easier to observe their behavior. They should be acclimated carefully, as sudden changes in salinity, pH, or temperature can stress marine crustaceans.

Diet & Nutrition

Pom Pom Crabs are omnivorous scavengers that feed on leftover foods, detritus, small meaty foods, and suspended particles.

Diet: Omnivorous – Eats meaty foods, detritus, leftover food, and small organic particles
Recommended Foods:
Frozen mysis shrimp
Brine shrimp
Finely chopped seafood
Small sinking pellets
Plankton-based foods
Leftover foods from regular fish feedings

Although Pom Pom Crabs may use their anemones to help collect food, they should still be fed regularly in the aquarium. Target feeding small portions near their hiding area can help ensure they receive enough food, especially in tanks with fast-feeding fish or other scavengers.

Lifespan & Growth Rate

Lifespan: 2-3+ years with proper care
Growth Rate: Slow to Moderate – Usually remains small and suitable for nano aquariums

Pom Pom Crabs stay much smaller than many other marine crabs, making them well suited for reef tanks where a less disruptive crab is preferred. Like other crustaceans, they grow by molting and require stable water parameters to molt successfully.

Temperament & Compatibility

Temperament: Peaceful – Generally safe with peaceful fish, corals, and most reef invertebrates
Reef Safe? Yes – Does not harm corals, though it may hide among rockwork or occasionally climb on coral structures

Pom Pom Crabs are excellent choices for peaceful reef aquariums and nano tanks. They should not be housed with aggressive crab predators such as triggers, puffers, hawkfish, large wrasses, lionfish, large crabs, or other animals that may eat small ornamental crustaceans. Because of their small size, they are best kept with calm tankmates that will not outcompete or harass them.

Common Challenges & Considerations

Small & Secretive: Pom Pom Crabs may hide frequently, especially in larger aquariums or tanks with active fish.
May Lose Anemones: Some individuals may lose one or both anemones over time, though they can still survive without them.
Needs Regular Feeding: They should not be expected to survive only on scraps or detritus in very clean systems.
Molting Sensitivity: Sudden changes in salinity, pH, or alkalinity can cause stress during molting.
Sensitive to Copper: Like all marine crabs, they should never be exposed to copper-based medications.
Best With Peaceful Tankmates: Larger predatory fish or crabs may injure or eat them.

To prevent issues, acclimate them carefully, provide plenty of rockwork and hiding areas, feed small meaty foods regularly, avoid copper exposure, and keep them with peaceful reef-safe tankmates.

Water Conditions

Temperature: 72-78°F
dKH Alkalinity: 8-12
pH: 8.1-8.4
Specific Gravity: 1.023-1.025