I have my 75 cycling with live rock right now. I'm planning on two ocellaris or percula clowns (everything else is up in the air). I was on a web site that sells clean up crew packages. The package for my tank had like 65 blue leg hermit crabs, a bunch of snails and various other things. all are these necessary for a fowlr tank? if not, what would be a decent clean up crew to have?