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IMO it should be about 10-15 times but also IMO it needs to be chaotic flow. Not a straight direction flow. I have a mag 12 and a mag 9.5 return line aimed at each other to provide this chaotic flow in the tank.
Thanks again. I understand there can bee too much flow also. Can the sump/refugium be too big? I plan on having a small DT for now, upgrade to larger. If I put the sump in the basement, I will have a lot of room for a large sump for may later purchase of a 180 gal tank. But start with a 40 or 50 to be sure I can keep up with all I need to do for these critters.