I recently had what appears to be pfiesteria break out in my tank after a few recent additions. Many of these fish are from all over the world and every time they get transferred some of the original water makes the jump w/ them. God knows what is in the tank now. so far, two dats have died.. marked w/ oval shaped spots where the skin appeared to be removed almost as w/ a sharp instrument. Im scared to even put my hands in the tank to do an h20 change..