I am going to order lights for a new 75Gal. reef this week. I am getting two MH 250 watt with electronic ballast. Not sure if I want SE or DE. Any pros or cons of either would be helpfil. Also for actinics, since I only have 47.5" in my canopy, I thinking two 36" T5 HO Tru Actinic or two 46.5" Fluorescent VHO URI super actinic. Any suggestions or comments appreciated.