Considering the depth of your tank, you would need stronger lighting than a tank that is say, 18" deep. What brand is the fixture? That may give an indication of watts. You will definitely need to know this before buying bulbs for it. Maybe you can contact the person that had the tank before you.
Considering the bulbs are only 36" and there are only 3 of them, I would suggest you look at replacing the lights in the near future. In the long run, it will just work better. I would suggest you look for a 6 bulb 48" T5HO fixture which would do fairly well for LPS and softie corals although not too many would thrive at the bottom of the tank. Another option which would penetrate the depth of the tank better would be halides in which case I would suggest two 150 watt halides supplemented with two 48" T5HO bulbs. The T5s would run for 12 hour a day or so where the halides would run for 6-8 hours.
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~ Mindy
SPS fanatic.
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