Hello, I'm new to this and hope someone out there can help me. We have three tanks, a 40 gallon community tank a 30 gallon tank with African cichlids and catfish and a 1 gallon for sick fish and Quarrantine. My catfish have been calm the last couple of days, the tank was cleaned 6 days ago,my ph is at 6.8 (has been since the start) but one of my catfish (kitty) has a sore on his mouth. They all have been living together since the beginning of September and get along fine. I'm worried about him, I know I can't treat the water with quik cure,I learned that the hard way in my community tank when we got ich, I lost my catfish and my pleco. I've been looking up answers on the internet but I'm lost! Can anyone help me, I hate losing my fish.