I have 2 Black-Tailed Dascyllus that appear to have some damage to their dorsal fins. I do not have any other fish with anything like it. I have 6 Blue / Green Chromies, 3 Blue Damsels, 2 Lemon Damselfish, 13 hermit crabs, & 6 snails, 1 Cleaner Shrimp, and 3 Peppermint shrimp. All seem to be...