Yes, I agree with Phloxface. Angel needs to have a lot of clean water with a little medication and temperatures of 80 to 82 degrees, no cooler.
With just going through a water issue, Bettas can get fin rot very easily. AND while a lot of fish can be treated for fin rot or the prevention of it with torn fins without the use of medication Bettas are not some that can be handled that way. You see, the fins are just too large and numerous for them to be handled with only water changes. Once that fin tissue is damaged, it is very hard to get a good heal on it without some type of help.
Please let us know how Angel is doing and keep us informed of her progress.
Rose
