i have a spiny box, and a yellow spotted box, both are said to nip at softies and inverts but I have no troubles. I think it probably has to do with the fact of if it likes frozen food or not and if it fed enough. I had a damsel that ate 90% of my goniopora, and a ton of xenia before I caught it in a fish trap that was one of my "if i had only thought of that sooner..." moments.