I agree that part of the brightness problem could be caused by the fact that there are currently no plants (I have driftwood, but it's still soaking). There are some rocks, but they are white. Still, if it's that bright at 40 watts...and I have to double it? I had the sand for several years and I truly grew to hate it. I found it expensive and impossible to clean. It was always getting sucked up in the siphon. Also, it seemed a great medium for algee. I had to keep moving it around infront of the glass because it always looked dirty. In addition to that I think the process of switching back to sand would be very stressful for my fish who have finially settled in. As much as I'd love to have a beautiful, heavily planted tank, I'm willing to start with stuff I have to fasten to rocks and driftwood.