over the last few days it seems to have gained some extra bouyancy and now does a pretty good impersonation of a hot air balloon.
First noticed the over it looked as if it was standing upright on its tail but in fact it was hovering just off the ground. Now it look like as if it is having trouble keeping itself down low and is drifting up to the top of this tank in this position.
Anyone got any ideas what is going on here?
Btw, all other fish seem fine and I've checked Ph, nitrite, nitrate, amonia and theres nothing out of the ordinary there.