I have read so much on lighting that I want to scream. All I want to know is which is better PC's or VHO lighting? I have a 58 Gallon Tank that is 36 Inches long and 18 inches deep. I want to keep Corals and clams do i really need to go to MH'S or would PC'S or VHO's be better. All I really Need is the straight facts. :?