I have 5 gallon Fluval Chi tank, and I treat it with Stress Zyme and Stress Coat and have a heater. Did your fish heal from his ordeal with fin biting or whatever was wrong with him? I got my fish at the end of April 2015 and he has been having issues since early June. I'm getting really frustrated. I have given him medicine for fin rot early on, and tried Primafix but backed out on that really quickly. I'm wondering if weekly water changes and patience are going to do the trick. Any advice?