Alright so my betta Felix is currently in a 2.5 gallon heated tank, no filter. I normally clean it about twice a week but for the past month have probably only been cleaning once a week due to my busy schedule. I noticed that his tail fin and the fin underneath him(sorry no clue on the names) were turning white/red around the edges and about 1/4 of the way up his tail. I couldnt remember if his fins had always been that color or if they'd changed so I looked back at old pics and sure enough they had changed. I went to my pet store and was going to buy jungle fungus clear but since they came in fizz tabs made for 10 gallon the pet store guy(I know you cant really trust them but I had no one else to ask since I'd gone there thinking the jungle clear was what I wanted.
Anyways he suggested Melafix because it was more easily measured being a liquid. I cleaned his tank last night really good and put in the med. I put him in later and he seemed totally fine. When I woke up this morning he's still very active but his tail fin (how do I explain...) The white and red is pretty much gone but some of his tail fin is also. It's like the bad parts of his fin are gone and you can see it shredded a little bit.
I'm really worried! I dont know if this is bad or good. It seems bad because his tail is a bit shredded but it also seems like maybe thats the way it works....like it gets rid of the bad stuff first then works on regrowth????Gosh I dont know what to do. Can anyone help me??