My african cichlids have something weird going on with there skin. They have these pale white patches showing up on there heads and mouth. I know its not columnaris cause i just treated for that a few months ago and it isnt little white dots so its not ick. It looks like transparent spots. The fish hacve had it for sometime now. No swelling or anything dying. Just weird? I have been keeping the lights off more then normal but my water is in good health. I monitor nitrates and ph.