I have been looking at all the options out there for a good housekeeping crew for my 55g FOWLR. I am thinking of getting a brittle star, a searpant star, 3 or 4 emerald crabs, 10 cerith snails and maybe 10 nassurius snails. I am not a big fan of hermit crabs. and I think I would prefer to stick with smaller snails as they seem to get arround the rockwork better. any body have any other ideas or suggestions. I was considering getting a sandsifting cucumber or two but I read that if they feel threatened they might expell there insides and poison the tank. I dont need that. also do the nassarius and cerith snails stay on the sand bed or do they also clean the rock and glass? any info or ideas pointers would be greatly appreciated.