I will tee off one of the external, shelf-type overflows to send raw water to the refugia (I’m in the middle of plumbing design, based on info from Aquatic Systems Engineering by Escobal). I may alternatively go with a couple of the stand alone ETSS skimmers, but they are pricey. I’d like to stick with 2 so I can clean them alternately, and the Aqua Cs are more cost effective. I want to keep SPS corals and clams eventually, and I don’t plan on having a very large fish load. My calculations show that a tank with the dimensions shown that is 36in deep will be able to hold ~650 gallons (minus the amount displaced by a 6in deep sand bed). The to
