you have to cram allot of t5's on deep aquariums for them to work. That takes tones of power, not to mention it will be hard to access the aquarium with out the risk of getting burned on the lights. You can do it with VHO, but it still doesn't seem right. The aquariums I've seen sps aquariums with VHO, they have their entire hoods covered with bulbs. You can just use a couple VHOs, but you will have to keep the sps corals in the first 6 inches, that leaves little room for growth. Leds in my opinion are best, they are low energy, low cost to run , and not that expensive if you do DIY. I made my led fixture for $300. I rented a PAR meter and found that it put out the same PAR as a 250 watt metal halide. Since my aquarium is only 20 inches deep, I toned it down to %50; about a 175 watt or so. Since it takes only 75 watts, and I only have to replace it every 10 years, I save a bucket load of cash over it's life time.