When my experiment is done there is a very good chance I’ll be selling that T5 halide giesemann fixture and replacing it with an all T5 ATI. My all T5 is performing just as well as the halide T5 hybrid. The T5 halide hybrid is better suited for a display tank because of the shimmer you get. The corals pop nicely.I know. It defies logic. I'll fully admit it. Maybe this thread was a good gut check to stick with the T5s. Another thread by boomcorals regarding comparison of kessil and t5/MH has yielded interesting results that has also convinced me to stay with T5s.