Tek 6x54w fixture. It's built very well, has amazing refectors for the price. It's "almost" like buying an ATI fixture for half the price. I would dare even suggest going with the 8 bulb fixture, leaving the back 2 bulbs out, and using 2 low par actinic bulbs to supplement color. This is what I've got going on with my tank. I have 2 blue+ bulbs, 2 actinic 03 bulbs, a purple bulb, and a crisp daytime bulb and get a beautiful ~17000k daytime look. I also have a warmer ge 6500k daytime bulb that pushes the tank to a 14000k daytime color. This is enough light to keep everything in my tank happy, including my haddoni carpet on the sand. Plus I can always throw 2 more bulbs in if needed in the future. You can do so much more with an 8 bulb fixture, even if you only ever need 6.