Being mostly nocturnal the Sponge Crab will need plenty of reef work or aquascaping to provide it with caves and dark crevices in which to spend its days. While Sponge Crabs typically have sponges afixed to their backs, they will sometimes harvest tunicates or even coral polyps for camouflage. By doing this they may cause harm to some soft or polyp corals, but this usually helps propagate these corals throughout the aquarium, more than it does harm to them. This species as with all crustacean species should not be kept with species that will eat crustaceans, such as triggerfish.
As with most all crabs, the Sponge Crab is a scavenger that will eat most any meaty food. The diet of the Sponge Crab should include meaty foods such as frozen brine or mysis shrimp, mussels or pieces of fish. This species will also eat any foods that get by the fish in the aquarium, making them good for keeping the aquarium free of excess and decaying food stuffs.