Two weeks ago I purchased an acan eye and my peppermint shrimp devoured it over night. I then purchased a second one, thinking maybe there was just something on the first which made it go after it. The peppermint shrimp devoured it in two days. Yesterday, they starting attacking a moon brain. Any suggestions? I am not feeding them anything besides the pellets that I am feeding the fish. Thoughts? Suggestions? Do I just need to stay away from coral that is in this sort of shape as their are similarities in form between these type of corals. They have left zoanthids, mushrooms and polyps alone.