A bit of a flippant title to this thread I guess. The fact is that I was very concerned about 12 neons that I added to my tank a couple of weeks ago. Their new "roomies" were 5 lemon tetras, 5 rasbora het., and 3 serpae tetras. The Neons' tail fins were tattered to varying degrees a few days later. One Neon basically had a naked tail. Unbelievable...the fins are growing back! I suspect that the Serpae had something to do with this, but they appear to have reformed!