My mother-in-law knows I am experienced with fish and love bettas, so when she saw this little guy (his temp name is Bubble Barnsworth) at Walmart she brought him home to me to nurse back to health. Thankfully she also brought me a 5 gallon tank (since I've drilled it in to her that bettas need this size at least). So I used some filter medium and rocks from an established tank and some of the bacteria seed stuff to force cycle the tank and in he went. Better than his cup of nasty water to be sure.
Well here's the problem. I've never had a betta get really sick before (except once with a swim bladder problem) so I'm not sure what's wrong with this little guy.
In his cup he was just lying on his side on the bottom, barely moving and slightly curved. The water was so dirty it was cloudy and there were floating pieces of debris (I have to assume uneaten food). But if you jostled the cup he'd start moving around. In the tank he mostly just rests on the bottom but when he does decide to move he doesn't appear to have much trouble, though he still generally stays along the bottom. He looks like he's tired though when he swims. He can get to the top for air fine though. He looks like he might be breathing a bit labored, but then again I'm not sure since I don't usually have bettas that just lay there and let me watch them breathe. I've had him for 2 days now. I have yet to see him eat. I've been offering him bloodworms since my mother-in-law didn't bring anything else and that's what my other betta prefers.
I don't see any spots on his anywhere, no weird marks, or anything that indicates a physical injury. Just the fact that his body is curved when he's laying on the bottom. I don't see it once he gets moving.
I do have the water treated to help his slime coat to help him with stress. No sure where else to go with this though.