The straighter you make the return, larger ID of tubing, and fewer fittings will give you the most flow. I use 1" on my 3/4" iwaki.
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180 Mixed Reef
SRO-5000 Skimmer
Neptune APEX Gold
Kessil AP700/ MP60+6105
Kalk+2 part/ Cheato Fuge
Current Tank Info: 180 SPS Dominant
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