As of right this moment, i am acclimating a brand new betta in a 2.5 gal tank (i know its small but is heated, filtered, live plants, and will change water every few days, and hopefully only going to be until i have money for a 5gal). I purposefully picked the betta worse for ware at petco because their little cups are awful and theyll literally let them sit dead on the shelf for days. This little guy was super lethargic and kind of floating on his side. I want to guess swim bladder, but havent observed him long enough to really be positive. From reading similar posts here and on other forums, theyve all said this isnt a death sentence and could either be treated or a condition he'll just always have. Since my tanks heat and conditions are good im hoping itll work itself out, but id not then ive been told it could be his system from over feeding or infection. Not planning on feeding him for at least the first 24 hrs, but should i give him a pea when i do to try and clean him out if thats the problem? Hopefully this will only be temp once he's settled in, but would love suggestions!! UPDATE 7/6/16 Ive named the poor guy Julep. He isnt AS bad as before, but still stays right at top of water and his backend still wants to float. I just fed him pea, but it was more so him attacking it. Didnt spit anything out though, so im hoping he got enough. I honestly think his color has already started to change too? But maybe thats just me UPDATE 7/9/16 Julep is still hangin in there. He isnt bad, but not great either. Seems to be behaving like a normal betta besides literally being unable to descend in the water though? Eating, pooping, and flaring. Im beginning to think this might just be how he's going to be?