Lots of people aim for roughly 5X turnover through a sump, but that depends on personal preference. Are you keeping a skimmer in the refugium? So if you go with a 5X turnover rate, with a flow rate of approximately 250GPH at 3' head, you could go with something like the Danner Mag-Drive 350 or something similar.
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~Drew
10G Nano * 10G Sump * Deltec MCE 600 Skimmer * JBL Viper 150w MH * Zeovit * Vortech MP40W
Millions long for immortality who do not know what to do with themselves on a rainy Sunday afternoon. ~S. Ertz
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