What eats poo?

I have a 20 gallon long tank that's a month and a half old, 1 cinnamon clown, 2 turbo snails, and a peppermint shrimp. My question is what eats fish and turbo snail poo? I don't like the idea of constantly sucking it up because it scares my clown. So I try to restrict that to Sundays only when I do my 10% water change. I don't like leaving it in there so is there anything that helps out and has to be reef safe. Any snails, starfish, cucumbers ( idk if those are reef safe) or anything?