Since you are using Eco-rox and just a small seeder rock just put your sand in.
Usually when you cure your rock in your tank you get allot of die off that settles on the bottom. It is easier to remove it without sand.
You won't have this problem because there is nothing to die off. 
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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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