ok so I found a deal on the metal halides from a fellow reef central user so now all I need is the t-5 stuff. Whick brings the next question. Whick ballast and combo is best??? Like I said I got a 90 gallon reef and want to keep both soft and hard corals. Id like to run the t-5s mostly but have the halides on a few hours a day for added light and effect. How many bulbs should I get 4 or 6 and which ballast the 660 or...????