My bad... I was absent that day, glass it is. My tank is 96 x 36 x 36 I run (6) 400 watt on HQI , (4) 160 watt VHO's and (4) 96 watt PC's. I Have grown SPS frags at the bottom of the tank. I think as long as you go no deeper than 36" 400's will work just fine. With good reflectors you might get by with (8) for SPS...
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