I have 3 fish with white stuff foring on their bodies, I cant figure out what they are but i know they could not be ich or something of the like> I have a 20 gal hooked up to a fluval 405 with water parameters near perfect; with 7.4 ph, 12.5 ammonia, 0 nitrites, and 0 nitrates. I have 1 gbr, 7...