Since saturday i have 2 waterdogs, since yesterday 1 is having trouble staying on the bottom and he seems to not be able to stay down at all without holding on to things. i read online it could be gas since its only his butt thats up so to help him out not be tired i put him in a tank with a lot less water.... seems less stressed this way but its not ideal for him ofcourse.. i though maybe he's morphing so i put a big rock on the side of the tank where he can go on and hide in case thats it but since there is no sign of his air things getting smaller or his tail changing in comparison to the other one... there is no bullying so i doubt the other would have done it too him... this one also didn't eat as much as the other and hasn't pooped that much either... any advice on what it is or how to fix it..