Guess what! UPGRADE TIME

[kien]

If you are having great success with the light now, I don't think another 2" up is going to make a huge difference. I personally wouldn't rest it right on the tank as you'll likely get a lot of salt creep on it ultimately dimming the light as a result. Presumably your new rock work will be different so that is going to play a role in how much light your various corals will get as well.