it could just be the swim bladder disease. he could be dying but i wouldnt know for sure. i would go to a petstore and tell the person who works there and see what they say. if they say it can be cured ask them how and the types of medication and what to do to cure it. hope this helps. just do anything so it wont die!!! or else im crying!!
My dad said it has the shimmy's whatever that is and he is a big-time fish expert, bad news though he says 99% of the time they die so i would think its time to say goodbye... "" """"" im crying on the inside for you. im sorry about the fish.