you need no more sand. if anything you will need less. the solution to pollution is dillution; you need as much water as you can get in a 10g. at the same time stay away from the viper clamp on MH light. The price is good but the lumen is not. If your going the MH route get something a little nicer. In your case Id go with T-5's, not only for the corals but for the alliance! couldnt help my self.... Seriously T-5's. Do it.