Unless you are 12mm or thicker you can't really notice the difference so in my opinion unless you go 12mm or more it is not worth the extra cost.
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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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