Okay so, my datnoid since around the middle of the day has started swimming in the high-middle to high part of the tank and when I turned on the light to check on him he tried swimming down but when he went down he just kinda crashed into the rocks head first like he couldnt see it coming??? he has a bubble eye or something where the eye looks a little inflated and I've been giving him medacine for it but it doesnt seem to be getting any better but its only on one eye. Also he looks a little darker but not super dark like I when I first put him into this tank and he seems to be breathing kinda hard and his mouth is open wider then normal like he needs to get more water in. I really dont want him to die could someone please help me