Hi Matt... sounds like you came from reef keeping?
The bioload you are concerned about isn't nearly as much of a concern with a planted tank. The plants themselves act as natural filters and keep the nutrients out of the water column. We have to dose ferts because the plants literally eat all available nutrients in the water.
I really can't see an advantage in keeping the extra water to cycle through your tank unless you wanted to overly stock your tank with fish. The old 'dilution is the solution to pollution' doesn't exactly apply in a planted tank. With a high-light, high-tech setup you are going for, plants are going to be sucking up those nutrients out of the water. Of course water changes are going to still need to be done and the plants don't remove everything, but I think that extra water would be better off reserved for a water change than cycled into the tank IMO.
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