Thinking I might add a small crab to the tank but what kind do you recommend? I don't want any that will kill fish or get into coral. here is my livestock list as of now. 2 Ocell. clowns 1 lawnmower blenny 1 allen's damsel 1 Mandarin 1 royal pincushion urchin 6 snails (don't know what kind) 1 conch various mushrooms unidentified soft cocral pulsing xenia sponge LOTS of brittle stars Feather duster Paly's I'm not sure what other fish I'll be adding, I just kind of find one I like that is compatable with what I have. So crab just needs to be friendly as I also plan to add more soft corals in a few months. I haven't done much research on crabs but I'm guessing they are night stalkiers so probably won't see them? and do they require special feeding?