betta male finrot

Hello! My dads beta fish, we’ve had him for just over a year, is suddenly loosing a lot of his fins. It started about a month ago and we figured it was fin rot and started doing 25% everyday. and. Well. He hasn’t gotten better. It started off small but then this last week we had to go somewhere...

It appears to be fungal, as one of the two tiny holes seems to have white fuzz on it. I have ESHa exit which contains methylene blue, although it is an ich treatment, will that help?

I have two male bettas that sadly had a bad case of fin rot. My one male, Ghost, was not nearly as affected by it as my other one. The two of them have never been kept in the same tank, and I know them contracting it is completely my own fault, but I've been trying so hard to help these boys get...