My crowntail goes down into the corner of his tank where my mesh divider is (my other CT is no where's in his line of vision, flares, swims in a zig zag rapidly, freaks out and swims to the top really fast, and repeats the process. Haha! Maybe it's a CT thing? ;) My bf thinks he is playing in the current. I think he's mental. My other CT I've never seen flare. He prefers stalking things.
I don't really have any other suggestions than to cover the sides of your tank/turn light off so it's not as reflective.