I just got a betta (my first fish) two weeks ago and noticed his fins have started to split.
He lives in a 3.5gal filtered tank ( no heater yet, but I plan on getting one in the future - any amazon recommendations would be appreciated).
I’ve used bettafix over the last week but have not noticed any change for the better in his fins. I’m not sure if its fin rot or split for another reason. I got a sponge for the intake of the filter as I noticed he was wrapping himself around it.
He still seems to be swimming around like a happy fish but does sit on the bottom from time to time.
Any help as to what should be done would be much appreciated. Thank you