I run a Dart 3200 GPH on a 4 way closed loop for internal but only 600 GPH for my return on my 75 Gal. Had to take my LPS out though they did not like it at all my zoe's don't mind the flow though.
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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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