This morning when I was checking on things, I found him floating on his back. I gave him a nudge and he swam down, but floated back up. I could see an air bubble in his belly, so staying on the bottom seems impossible. During one of my attempts to push him down he got vertical with the tail down......and out came a little bubble from his mouth. As soon as that happened he went straight for food.



So I guess 'burping' is needed occasionally.