in the middle of cycling my 20 gallon long, it has about 30-35 lbs of dead rock (used to be live rock but I bought it dry) I’m going to add a small couple PCs of live live rock to help seed, anyway what is a clean up crew I can add that will not harm if I get a couple soft corals, I plan on two false clowns, and possibly a pistol shrimp/ goby combo. I know bristle stars could work, I heard good and bad about hermit crabs, some snails, would a emerald crab work?