Thank u for ur honesty. It's much appreciated. Knowing my luck and computer skills, I would probably end up sending mine back to have EcoTech straighten out my mess. I also have good growth in the natural mode. My SPS is growing beautifully under the 50% intensity. Any higher and I'm afraid of damaging my highly prized Torch Coral. I have a rather shallow corals tank, so as far as setting corals at various depths is pretty much out of the question. About the only real reason I thought about the artificial mode was for Luna lighting. Nothing more beautiful than watching my Golden Torch under blue lights at night. Almost radiates it's color! Again, thank u