Hey guys, I posted about this awhile back, my betta Lupin looks like he may have fin rot or he ripped his top fin almost completely off somehow in his old tank. In his new one I've been doing water changes twice a week, sometimes more, he has a heater and his water is always at around 80 degrees, and I add stress coat with every change. His fin just isnt growing back. He has this little fin like 'nub' now that might have gotten a little longer, but that's it.
So is there anything else I should be trying? I've thought about aquarium salt, I just don't know how much to put in a 2.6 gallon tank. Any info would be appreciated.