one of my rays has for the last few days been crusing the mid zone....it "flys" around the mid-tank till it touches something, then it moves back almost like it is taking a look at what it hit...then continues...it also goes up and down on the glass alot...it hovers and pokes its nose of the disc out of the water...it has gone almost completely upside down at the surface when crusing the top once...i think it is exploring the tank, but i do have a small feeling that it could be somthing more(due to the fact that after like 2 weeks of having them it just started now), the last time i had a second geuss i had a tsn get eatten...so i just want to be sure...it eats and looks heathy....any thoughts, is it normall or not...