I've got it. It does seem to be a bit finicky when parameters swing. At the moment mine is in a 30 cube loaded with huge favias that constantly suck up my alkalinity. I'm sure once I transfer it to the 150 I'm hoping for more consistent color. Mine is shallow right under my 250 halide. If I had a preference I'd keep it at medium depth medium light and medium flow. The only place I can keep mine at the moment is on my frag rack. Fast grower!