I've had a GBTA for a couple of years and he's been happy and sedentary. Right about the time I switched to a 175 Iwasaki 15 K it took off and now very high on the back wall. I recently got a RBTA and put down where the other one started out and it immediately took off and also ended up high up in a corner. It's a 50 ga tank with the one halide and a little actinic supplementation. The fixture is 2 inches above the water. The RBTA came from a tank with t5s. Do you think it's too much light?