I think the carbon helps remove the organics, putting cleaner water to the GFO leaving more clean surface area. However, overall I prefer to run them separately for flow control and media changes based on the specific exhaustion of one or the other . If the pump is the issue you can tee one off with separate flow controls for each reactor.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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