I skipped over from the first post to here. The best lagoon that I ever saw was a pair of 1000w 6500k MH on a light mover. They also did a really good job of having solid corals in there that look awesome under this light - pink and purple poci and stylo, yellow porites and deep blues look good too. You have to keep the sand white, so some gobies can really help. Once the coralline gets going, it should look really good.