I am worried...He is in a 55 Gallon aquarium with my Albino Oscar, Ivory (don't worry, he is a good 6 inches...Ivory couldn't eat him if she tried...) One side, not front, is facing the window and he is swimming up, right, down, left, pause then all over again...is it because of the light? I am worried...he is eating well...sinking tablets and whatever mess Ivory spits out (She is VERY VERY messy) from her pellets...any suggestions???