You'll be fine with 6 bulbs. Should be anywhere in the tank. I was running a 36x21x18 with 6xt5ho and was growing everything... maxima clams, and sps included at all depths of the tank.
BTW... if you're looking for a good used light that I no longer need, I have a 36" aquaticlife 6xt5ho for sale. Built in timers and all. $250 now, or $200 in a month or 2. Let me know if you're interested.
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