Hey, my axololt has been doing this weird thing twice now where I've seen him sitting high in the water. One night my partner accidently turned off the filter & in the morning my axie was up the top of the tank next to the filter. I almost had a heart attack! Needless to say filter has been on since then with me always checking! But tonight I went to feed him & he was sitting on top of one of the artificial plants not moving! Why does he do this? Is it normal? He's down at the bottom now & moving. 