My vote would be for a slow outflow of water (more contact time inside the fuge), but you want decent water movement inside the fuge.
I use a MJ300 to feed my 20g fuge and a MJ1200 inside the fuge for water movement.
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Current Tank setup since Jan 2005
75g Reef w/fish, 10g sump, 20g refugium
2X150W DE Magachrome 20K, Korallin 1502 CaRa
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