I have a 58g tank with 20lbs of live rock and 1.5 " of live sand. My critters are a juvinile pair of clowns, a lawnmower blennie, a banded coral shrimp, a sand sifting sea star, a horse shoe crab, and a couple of astra snails, and small starburst polyp coral ( I know i shouldnt have it yet, but...