I have a 55 gal tank with live sand, live rock (70 lbs) and some fish (3 tangs, 2 clownfish) and hermit crabs, snails, etc. I want to add some corals and make it look cool but I have recently read several articles talking about toxic zoanthids, etc. I want to be able to stick my hand in the tank without fear of getting sick/dying yet I want some some cool looking stuff. My question is...what can I put in my tank that isn't toxic/dangerous? Are zoos the only toxic corals? Thanks in advance.