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How would it be any different though, the sump grown vs reactor grown? It sounds like algae that forms naturally wouldn't be the artificially grown variety. You're still growing algae with an artificial light source and letting your tank water flow through it in both situations.
Some Pods also eat detritus and whatnot. I have pods in my sump without a stitch of algae down there for over a year. Lots of rock rubble though.
But that's very interesting because you would think the algae is uptaking nutrients faster in an artificial setting.
My guess is the reactor grown algae grow so fast it is not as nutrient dense as refugium grown algae. Just speculating...