When I first acquired my Iridescent Shark, he didn't have any barbels. I didn't even know he was supposed to have any, but then, I didn't know he was really a catfish either. "Shark" is just because their appearance. Anyway, the Cichlids had short and/or frayed fins as well. I did the Melafix treatment on the entire tank and over time, the fins are longer and nicely tapered on the cichlids (one is even starting to grow his tail fin back, which was bitten off by a Piranha before I acquired the tank) and the I.D. Shark has some very nice barbels. I had to give him up today though. He did so well under my care that the guy is too big for my tank. He is occupying a very nice 50 gallon all to himself in an unusually nice LFS this evening.