My son's betta Rock N Roll has been having some SBD issues as of late. He'd been doing fine for a couple of days when 2 days ago my son noticed that he was having a hard time swimming down into the bottom of the tank - he could get down, but then he'd pop right back up again, almost like he was too buoyant.
We've been fasting him for the past 2 days and this morning I was initially delighted to find him swimming around all over the tank, including near the bottom, without apparent difficulty.
Now, though, he seems to have developed an opposite problem - although he can swim fine very near the surface (like within mm) when he actually goes to the surface for air, his body becomes almost vertical, like his tail is weighted or something, and he can't stay at the surface for very long.
He otherwise seems fine but I'm worried he may not be getting enough air since he's only able to stay at the surface for a second or two at a time. I tried lowering the water level in his tank a bit, and he'll be getting a water change later today. I'm continuing to fast him until I have a better sense of what's going on.
Any thoughts/suggestions? Thanks!