I have a 40 breeder display, 20 long sump, my sump has a large refugium with chaeto and a deep sand bed. The display has 3 fish (2 clowns and a purple firefish) and a couple corals (mostly softies). I test with hanna checkers, nitrate is 0ppm and phosphate is 0.04ppm (phos reagent is expired though, trying to get new one). I have never had a skimmer before so not sure if it will still benefit my system in ways other than nitrate and phosphate. I'm trying to bring these levels up by feeding more but struggling to do so. I also dose All For Reef, if that is at all relevant.



