I started out with a 55 gallon FOWLR tank with 70 pounds live rock and 40 pounds live sand. I have an aqua clear 70 hob filter, 1 aqua clear 70 power head, 1 aqua clear 50 power head for water flow, and a coralife 65 skimmer. I added a 30 gallon refugium with an 4" sand bed and about 20 pounds live rock and caulerpa macro algae for nutrient export. I also have an aqua clear 30 filter on the refugium with the intake between the baffles. My nitrates still run between 20 - 40 ppm. My question is can I take out the filter media in the hob filters and let them run empty, just for flow, and that might help with the nitrate. Would I have enough filtration without the filter media? Any input would greatly be appreciated. THANKS!