Looks great and looks like you put lots of thought into your tank.
Not sure what MH you are running but on my tank thats about the same size I had my temp jump up about 3-4 degree in about 4hrs of light. A ice probe is only rated for about 1-3 degree pull down if I remember right. I had put two holes in my sump to run two but you also need two controllers. So in the end it was cheaper to get a real chiller. It takes a Mag 5 to run though so you would need to run that water off the main tank somehow. Maybe a over the top drain and sump.
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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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