you can get a kit from nano tuners... you have to mod it yourself... I called them once and they said that you can send your hood to nano tuners...labor is $60...I'm not sure how much it would cost in all.
I modded myown with 150watts of MH. I woudnt do that if I were you. Hard to keep parameters stable as well as when it comes to acclimating corals/fish to the light. Maybe 70watts is more then enough.