the water is fine i just changed it a couple days ago. the temp has been a lil cooler because of the weather. he is just laying on his side right now on the bottom.
add salt and bump up the temp for good measure. also, maracyn 2 treats symptoms of swim bladder disease, if that is in fact what it is. generally swim bladder infections make your fish float, though.
if it seems severe, i would. but it's your call, depending on severity and its progression. you could always do salt and temp now, and if things don't get better or get worse, dose maracyn 2.