is he like spiralling as in always turning a certain way or spiralling as in going belly up the spinning back upright, belly up, then upright again, if it's the later, i'd put him out of his misery, thats got something to do with the lateral line in them being damaged and cant keep themselves upright in the water anymore, most fish that we have do that usually die within a hour of it starting or i put them out of their misery