So I am setting up my red sea reefer 350, and the existing plumbing is hard plumbed with a gate valve controlled manifold for reactors. I am using a RO VarioS 2 for my return pump, which should give me between 500-400 gph at the outflow after headflow. This is plenty for sump turnover, and I have two vortechs in the display for flow as well. What I'm concerned about is losing too much return flow with adding a carbon reactor to the return plumbing. Do you think I can keep it low enough through the reactor and make this setup work? Worst case I have to run an external pump for the reactor, but I'd like to run it on the manifold.