For softies, I would think that a 4-bulb Tek would do the trick for you provided you are careful to pick bulbs with high PAR value. If you really like a bluer look then you may want more bulbs since blue lamps have less PAR. Be sure to replace T5s every 8 months too. I currently have 4 T5s over my 90, and they are only 36" (fixtures from a different tank), and they do a decent job of lighting the tank. I just use them for supplementals so they have blue lamps in them, and even then they are fairly bright.
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~ Mindy
SPS fanatic.
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