Adding further value, the Halloween Hermit Crab is known to efficiently eat algae including green hair algae and cyanobacteria. It also provides a valuable service of aerating aquarium substrate by sifting through the sand. Be aware that as the Halloween Hermit Crab attains a large size, this lumbering scavenger may disrupt rockwork or corals in reef aquariums. The Halloween Hermit Crab lives in abandoned snail or triton shells and may resort to attacking and eating a snail so it can use the shell for its home. To prevent this from happening, provide the Halloween Hermit Crab empty shells of assorted shapes and size.
If there is an insufficient amount of algae present, the Halloween Hermit Crab will need to be fed dried seaweed, as well as meaty items such as mysis shrimp.