My cockatoo cichlid was doing amazing. He was in QT for 2.5 weeks. healthy, ate, active, no issues.

Added him to main tank, and the EBR wasn't fond of him, but didnt do much.

So the cockatoo was just shy and hung out in the corner of the tank.

I get home from work and he's swimming around, but doing a barrel roll/spiral swim.

So i put him back in QT, and he's slow moving, bottom of the tank, bend shape.

Anyone seen this/know how to treat it, or is it too late?

....i dont get it