Hey everyone, So lately I've been mesmerized by the reef central forums. What I have found is that every nice sps tank always uses T5's and not metal halides. So finally after sleepless nights due to reading, I've decided to go T5. It offers so much more colour choices and according to most threads provides more growth and colour. Now the thing is how many should I go for? My tank is 900mm X 900mm X 600mm (High), so obviously I have to go for 39W T5's. My scaping is such that I don't have corals 100mm from the back and 100mm from the front, so I only need 700mm of effective lighting.