Emerald and hermit crabs, seahares, turbo, trochus, and astrea snails, starry and algae blennys, bullet gobies, and for tanks 75+g kole, tomini, and yellow tangs, 150+g most other tangs.
20 Gallon tank tht im starting with, i got a good bit of brown algae growing on glass and reef bed, so im gonna vacuum some of it with my gravel cleaner pump, then throw in a few snails? any good snails i can get that eat that stuff constantly or do ya gotta feed em certain snail food too