I'm helping to take care of my sisters betta fish which I thought would be a breeze given the fish I've taken care of in the past. After a few weeks of it being with me the betta has slowly been less active and seemed more and more sickly. The past week and a half the betta just lays on the ground on its side heavily breathing. It doesn't look good at all. I tested the water params and they are perfect which didn't make much sense to me. I changed the water, and had it treated with conditioner and put the betta back in. He hasn't eaten much. After about ten minutes of being in, he flipped out and did like a horizontal frantic swim on his side flipping out around the tank. I also noticed a few weeks ago that the fish had a sort of curved back but in a side to side way, not arched. I looked it up on the Internet and saw that some fish exhibit TB. I don't think he has or had this because it wasn't always curved, just sometimes. Does anyone have any advice or know what I should do? Any advice is helpful, thanks a lot.
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