O.k I think I'm going crazy, last week I lost my sea slug, I was hoping he had just buried himself somewhere and he would resurface later. But then today my sixline wrasse dissappeared, he was there lastnight and gone this morning. I have 1 brittle star(not the green one) and 1 serpent star, is it possible one of them is killing my fish at night? I thought only the green ones were aggressive. any advice would be great,I will remove them right away before they kill anything else