So i have a 30 gallon with a ruby red dragonet and a linear blenny(inverts are 1 skunk cleaner shrimp and 2 zebra snails). I wanted to get a pom pom crab to join my clean up crew and pick up extra food and detritus, but i have heard that they can sometimes be not reef safe and because dragonets are kinda slow I don't want mine getting stung my an anemone. Thanks, what are your thoughts?