After 9 days of 50% WC, inc the initial 100% WC that I did when I first noticed my bettas caudal fin was showing signs of fin rot; with added things like 3 tsp aquarium salt ( added in half increments each WC) , stress coat and vitachem/garlic food soak. My bettas fins went from looking like they were getting better, to suddenly developing a few more holes and even some more small blood spots in different areas after the inital ones healed. The caudal fin is where the tear that started this was, which is why it looks worse in the picture. That fin stopped progressing at least. I'm positive the last 3 days of crazy hot weather may be to blame for the sudden set back. His tank temperature was lowered to 78F when I started treatment to help stop bacteria growth. But the summer heat has it at 82F even with the lid and heater off. I have fans pointing at his tank now. Not that it helps much. (today it's 81.5) Yesterday (day 9) I upped his aquarium salt to 6 tsp as a last ditch attempt knowing that it's not good to keep them in salt past 10 days. Today I've simply done a 50% WC, added Stress Coat and not added more salt My question is: Where do I go from here?? Is there something else I can do now that I'm going to have to stop using the salt? I bought myself some API erythromycin. But I don't really want to use it unless I desperately need to. The salt and WCs really seemed to be helping. But I think the seasonal water temp change may have effected progress. He is also quite active and eating just as much as usual. So I keep thinking it's possibly not bad enough of a fin rot issue that I should be giving him the antibiotics. What do you guys think?