Hey all I did a 50% WC on my 36 g tank on Sunday. My water parameters are fine but tonight when I went to check on the fish I noticed a cottony fluffy growth on the side of my bleeding heart tetra looks like one of the other tetras nipped him. I hate when this happens it looks like fungus but am not sure. I have fungus guard in the house but before I treat the fish wanted to get another opinion. I have a small QT tank I can put the fish in to isolate him took some pics what do you think? I appreciate any advise. Thanks!