I have a file fish that seems pretty efficient... and easy to catch!
The raccoon in Dang's frag tank previously was in my display. He will destroy aiptasia and majano with great enthusiasm. However, once those were gone, he killed a few stylophora colonies and irritated many zoanthids (don't think he actually killed them but may have if left in the tank long enough). He also pecked off the polyp like things around the intake siphon of my large derasa clam. The clam looks like it will recover, but it was very angry for several days and the polyp structures have not grown back yet. He also pecked a hole in the central area of the mantle of a smaller crocea clam, not sure if that one will survive. It took me about 3 weeks to capture him. I used a large fish net and just left it in the tank a few days so the fish got comfortable with it. One day he swam in, and I quickly forced the net up against the glass.
I'd be very careful with a raccoon in a display. On the bright side, if you do have lots of aiptasia/majano he will probably eat those first before turning on your corals. He never did accept any prepared foods in my tank. I tried flake, PE mysis, blood worms, chopped prawn, chopped mussel. He had no interest.
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