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it depends wholly on what it is you are keeping/culturing in refugia.
Much like lighting and how important it is to define what species you will be keeping at what depth and their subsequent needs before (!) we buy lights/lamps
In the case of 'fuge water flow... it has been grossly underestimated to date. I'd say 10X turnover bare minimum in general... but more like 20X is better/best. You will find that Chaetomorpha and Graciliaria, etc grow much faster and with better vigor in such flow.
Any doubts?... look for nuisance algae that typically flourish in low flow environments like Cyanobacteria.
And like reef displays... be sure to distribute that flow well (no single nozzle injection). Produce random turbulent flow for most refugia to keep solids in suspension for increased opportunities for filter feeders to use/export the matter.
kindly,
Anthony
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"If you give a man a fish, he eats for a day... but if you teach a man to fish, he eats for a lifetime."
Current Tank Info: 2K gallon fishroom, garden ponds
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