My dumbo fin betta has fin rot ive only had him for a month, i did change his water a lot he is in a 5 gallon tank. I am really upset, i changed his water becauase i had not touched it in 3 weeks. He does have an aquarium co op filter and i had him in a one gallon bowl while i cleaned his tank and I put the amount it said and left him overnight while i let his clean tank run. I got betta fix this morning but i feel like it made it worse than the salt, which i think did help. i did see bleeding on his fins after the betta fix. I put him in his clean tank that does have the correct amount of aquarium salt. he is still very lively and feisty, his hunger has not gone away. Any other recommendations?