Bought a female betta at Petco several days ago. I got her settled into my little half gallon quarantine tank and fed her a pellet. The next day she was showing signs of swim bladder disorder. I fasted her for four days and then fed her some blanched pea. A day or so later she was swimming normally, and not stuck at the surface anymore. The day after that she was floating again, even though I hadn't fed her yet. I'm fasting her again now, but I still don't know what's causing the problem. She was swimming normally again this morning, but this afternoon she's super buoyant again. Oh, and if it makes a difference, she's bloated pretty badly. Just her tummy, not her whole body.
Any ideas on what might be plaguing this little girl? She's still super active, she just bounces right back to the surface whenever she swims down. I seem to be having terrible luck with bettas right now, she seemed fine at the pet store...
Her water stays between 78 and 80 degrees, and I've been doing every other day water changes since I'm not sure what's bothering her.