I have never seen this, not on any other fish. 180 gallon tank cycled and trates are 10-30 ppm due to 50%wc once a week, with an AC110,fx6 and a 3 sponge filters; pulling some air because of being hooked to a jehmco. stock is 5 severums, a bgk and a few lemons. when in water it looks like a beard, i took it out and is in a qt tank, i asked a few people other fish people I know personally and they all said it wasnt mouth fungus, so idk
