Been in the hobby for about 6 plus months and I’ve come across a problem. One of my clowns stopped eating. I just started dosing and I have no clue if that would cause the problem. The tank is fowlr tank. I’ve put Melafix in the water the past 2 days. I’ve noticed the white string out of the fish so I assumed it was bacterial. Still no feeding after two days. Any help would be greatly appreciated. I have the 13.5 evo tank and all parameters are in good shape and have been stable. Thanks!