lighting is always tough to answer on here because everyone has a diferent opinion. alot of people say use 8 watts to every gal of water you have. they also say use mh lights for corals and anem's. but there is always someone out there that uses something thats not suposed to work and has great results. so always remember that. i have a book called "ultimate marine aquariums" by michael pletta and there is a guy that has a 715gal reef and all he has is vho lighting and regular output lights. but, he has 14- 160 watt vho actinic, 6- 160 vho watt daylight, 2- 40 watt, and 2- 40 watt ultralume lights. this guy has over 250 fish, 90 stony corals, and 101 soft corals in it. this guy has an purple tip that is over 12 years old ans a lether that is ten years old and wieghs in at a wopping 120 lbs. so dont take the mh light thing as a nesesity.