I got a betta just over a week ago and he was doing FINE! swimming, flareing, and made a HUGE bubblenest! When I got him he had just some torn fins missing from his tail but no finrot. I treated the water for the torn fins and he was doing just fine!
The other day I noticed clamped fins, I thought I just needed to raise the temp. But now he has major clamped fins! I looked closer and he doesnt have any fin rot, ick, parasites, or velvet. Just clamped fins!
He lives in a 2.5 gallon, heated (78 DEG), not filtered (yet), I do 50% every 2 days 100% 5 days. Use water Top Fin water conditioner.
I don't know what to do because I don't know what's wrong! Any help?!