Well the 'worth' of it is debateable to some.. but regardless, if you are going to do it at all, doing it remotely - out of the main tank - is preferred for easier maintenance and so you have more vertical real estate in the main tank. This is how Mr. Plenum - Bob Goemans - does it now.
I suppose one benefit of doing it in a refugium is that it will move the plants closer to the light.
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