I have a coral beauty and i think he ate some of my hammer coral. I had a hammer with 3 heads, they were all healthy until one day after coming home from work, I found one of the heads was damaged and missing some of the little sprouts. I have a coral beauty, a tomato clown, a pseudochromis, a lawnmower blenny, and a sand goby, plus 4 peppermint shrimp and 5 turbo snails. I don't think any other of the fish would have eaten the hammmer, so i think the coral beauty has to be the one to eat the coral. Anyway, he, or someone finished off that branch of hammer and did not touch the other. I also have frogspawn, shrooms, xenia, sunflower coral, gsp's, and zoo's and none of them have been damaged other than that 1 incident. I have had the coral beauty in there for about 4 months. The "inicident" occurred about 6-8 weeks after I put the hammer coral in the tank. But I think that they are pretty safe still. I just put in a longnose butterfly yesterday and so far so good.