Cuttlefish Tankmates
We keep multiple brittle stars and snails in with multiple Sepia pharaonis and have had no problems with either animal. The tank will still need to be vacuumed occasionally to ensure that waste doesn't accumulate. Shrimp and hermit crabs may help out as well although the introduction of these two species is much more difficult. Brittle stars, and the like, are not a solution to that problem; rather an extra hand (or multiple arms in this case).