You dont need to worry about the brittle star, lots of people have brittle and serpent stars in their tanks, they are scavengers, not aggressive at allI know, but i got a brittle star and didnt want damsel to get ate. Couldnt put star in other tank because i didnt want my clowns to get ate the star came with a cleanup kit. I honestly posted this wandering if any of the above listed cc would eat my xenia