Hi everyone. I have a 20 gallon tank with about 6 cherry barb, two of which are male, and 4 female guppies. About a week ago, one of the males and one of the females has gotten this sort of white fuzz on their bodies. I'm assuming it might be fungus and have been using API pimafix in conjunction with API melafix.. and occasionally the Kordon rid fungus as well. The white has been slightly increasing over the week and I don't really know if there's anything I can do. When I google fungus on cherry barbs, it doesn't really look the same as it does on my fish... so it might not even be that. If anyone has any suggestions I'd be really grateful!
I will update the water parameters shortly as soon as I do the test. Pre water change my nitrates were around 20, nitrite 0, ammonia 0, water temperature 25-26 celcius. It's a fully cycled tank running for 2 years.