On a side note, unless you want it all, you don't need so much rock.
I have a 60g sump on my 75g DT for a total of 115g system water with less than 40lbs of LR. I have a decent skimmer and change out a 7" sock weekly.
With so much rock I forsee detritus issues in your future with PO4 and NO3 leaching back into your water.
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