I just hooked up a Vertex & a BRS media reactor in series in my big tank's sump but I'm using Hydroton (biomedia material) as live rock replacement. My sump used to be overfull of live rock but have now sold off 85lbs from the system and still have over 1 lb/gallon (including 60lbs of rubble). The outflow then feeds my Deltec Recirc skimmer. Seems to be working fine.
I use the 2 Little Fishies reactors for GFO/Phosban.
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