Ok so I'm posting this for my friend so I don't have all of the info, but her betta is quite bloated and she says his swim blatter looks swollen. I don't know the water stats but I do know he's in a 10 gallon filtered, cycled tank and he gets 25% water change twice a week, and he's in there alone. I will try to get more info from her asap, but any first thoughts?