So my Betta was a little bloated last week, he seemed slower. He was only in a gallon tank, I got a 2 gallon tank, and a heater and moved him into there. I also fasted him for two days. He is getting worse and is now only staying at the top of his tank not really moving. It also seems like he might be a little crooked which I read could maybe be swim Blatter disease. I did a 1/2 water change today and he is doing no better. I really don't want him to die but i don't know what else to do. I feel so guilty because I got him to give him a better life and he certainly isn't happy or seemingly healthy. Any help would be great... Please and thank you!
Here is i picture, i couldn't really get a good one of what his shape really looks like.