The tank I have Cosmo in came with an air stone which of course creates bubbles in the tank. His tank is kind of small, but its what I have for now, and my dad thinks the bubbles will stress him out. I didn't really notice him acting weird or anything, he's extremely active, eats normal, all that jazz. If I take the air stone out it will give him a tiny bit more room, but when I take it out he thinks its feeding time. I took it out right now and he's just staring at the top of the tank. Should I leave the air stone out or is there a reason to put it back in?