I tried to post a pic on what is wrong with my Red Zebra (Male powder Blue). It seems ther is an open wound like its scales are gone no longer blue but whiteish at the wound on the front of the head. I just changed out 20% of the water of my 55g. Tested the nitrate and is at or below 5mg, PH of 8.2 and temp of 77.degrees F. All other parameters are in range. I have other fish in the tank and nothing is wrong with them. I did loose a orange Red Zebra to a type of fungus that did attack the fishes body and eyes. I did treat the tank with Lifeguard from Tetra. Sorry for the long post but trying to explain as much as possable.