rickcasa has it right. 
I plan to fill the two sides with a DSB. I was going to fill them all the way with sand, but recommended depth for DSB is 6" max so I will put some plenums in at about 5" the center part will have rocks to the top of the DSB and I will place my corals up from that in the center. I have the 4 way running under the rocks so should have good flow in the center section.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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