I saw that as well I believe it involved filling it with epoxy and drilling holes I think it was in the lower section here somewhere.
Let me know how things work out for you as I have one as well. 
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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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