My blue veil tail Percy is sick! He has fin rot. Here's some facts about my tank and then I'll go into detail.
It's around 2 gallons
It stays at 76 degrees
No heater or filter (im working on that my mom thinks it's unnecessary)
He has lots of entertainment.
I do 50% water changes once a week and I do a 100% every now and then.
I left my house for a few days and someone was feeding my fish for me. Percy was absolutely fine when I left, but when I got back he was all brown and had black tips on his fins. It was pretty obviously fin rot. I gave him a water change and started treating him with bettafix (which I know some don't recommend but many many people I asked did). He looks pretty blue again but his green shine has yet to reappear :(. He still has fin rot. I don't know how long it takes for it to go away and I'm quite worried. If anyone can help that would be great.