My husband and I are new at this and I'm full of questions! My husband started a 36 gallon community tank a few weeks ago. His first fish were a betta and a male & female MM platy...no problems. Then he added 5 Glofish. The betta and platies were curious but didn't hurt them. But I thought the Glofish were acting weird. They stayed up on the surface of the water and wouldn't venture down into the tank. So we turned the aquarium light off, thinking maybe a little quiet time would help relax them. But instead, a couple of them started freaking out! They started zooming around the tank, back and forth, up and down, and slamming headlong into the side of the tank! I think one even hurt himself because he just kind of dropped to the bottom of the tank and stayed there for about ten minutes after hitting his head on the glass!! This behavior happens every time we turn the light off, but when we turn it back on, they all school together on the surface of the water. Is this normal for Glofish? We've checked the water chemistry and temp and all is well for the breed. Any thoughts??