i am rehabbing a old 45 gallon high tank to a reef tank. This tank is a tall tank. Probably 24" high. How much light do I need. I'm thinking a MH / T5 combo. How many watts on the MH do I need, 150, 250? I want no light limitations on what i can put in here when done. But then again, not crazy about spending 700 on a light for a small tank....thoughts?? I'm thinkin i need the 250 but have no experience w/ MH