Sweet looking tank! The AIs do produce some spotlighting,raising them up will help eliminate that, but it still seems a little high to me. Are you using the standard 4x40deg and 4x70deg lenses? If I just do the math, @12" I get 16.8" diameter coverage per lens puck for the 70deg and 8.74" for the 40 deg. So, the fixture is about 12x5, so, roughly 29x22" coverage for the 70degree optics and 21x14, per SOL unit. So, when you add the two sols together, lengthwise as you have, the 40s will cover the top of the tank evenly, but the 70s will leak a fair amount. Granted not all of that will be good light, as the area covered will be brightest in the center and get dimmer as you go out to the edges, but I suspect it will still spill some light. You have a lot of power though, so, it probably doesn't matter. I guess if you find that the 70s leak too much, you could also swap them out to 40s. That's a nice thing about AI, they will get you different lenses if you want them.