I have had two colonys of zooanthids for about 6 months now that were thriving and spreading at a pretty good rate. Then it seemed like a the polyp numbers began declining just one or two at a time. Then seemingly overnight, the rest, save about 3 total polyps, are gone. I have an ocellaris clown, who I really don't suspect, 3 peepermint shrimp, 20 or so hermits, and a bunch of various snails. Is it possible that the peppermint shrimp ate them. They did a great job wiping out an aptasia problem I had a while back, and it seems I've heard or read about peps occasionally making a meal of zooanthids. Could this be the case? Seems strange they would live with them for a few months then all at once make a late night snack of them. The other option is the hermits, which I hope is not the case because I would feel REALLY stupid for not heeding the warnings of so many people on this site. Has anyone ever had this problem?