So I just got a betta from a pet shop tonight. This is not my first. I got a new tank bc it's been awhile w/ decorations, a gentle filter, water treater, light. I set up his tank and treated his water. I do know that I didn't prepare him long enough for switching water and that's my fault. In the store he seemed just fine except he was in a cup basically. After a bit at home, I noticed that he floats vertically or swims upside down or on his side. I've only had him for like 6 hours but when I look at him sometimes that's the way he is in the tank. I'm a paranoid/worrisome person by nature so I went reading and it sounds like swim bladder w/e. But I don't know if I"m just overreacting. I'll update in the morning but any help is nice. Thanks.