I just bought a zoa frag a couple hours ago and on it there was a brittle star which i happened to see. He is fairly small and i wanted to know if it would be a good idea to keep it. I have heard that they are known to eat other inverts and fish and are known to grow quickly. I have also heard that they are great scavengers but ofcourse this all depends on the species. Please help i'm not sure what to do. I have a 55gallon tank with live coral and fish: possum wrasse, pajama card, bicolor blenny, and orange back wrasse.

