I will be having a new larger tank built this coming year and I would like to use the 250w MH (three) that I have in my current tank, in my new tank. How deep (top to bottom) can I have my new tank made and still use these lights. The new tank will be SPS heavy with corals at the top and mid ranges with zoas towards the bottom of the live rock and some chalices and other corals towards the bottom or on the bottom of the tank.