Have a 145g with a Dart on a CL. Started with a monster pump pump that even with head loss was giving 2000+gph through my 75g sump full open. After running awhile, valved it back to ~1000gph which seemed better (pulling less bubbles through, more settling of detritus, etc).
Ended up replacing the return with an Iwaki 70 series (still get ~1000gph).
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