I have a 22 gallon mixed tank with a ten gallon sump, sump has a protein skimmer , chaeto, and return pump. I have 2 clowns, a canary blenny and a goby, along with 3 hermits, and some snails. I have six groups of zoa's, an anemone, favia, acan, a war coral, a lepto, and a cyphastrea (all small and new). I checked my water specs and constantly get 40 ppm on nitrates even on the day after a water change, salinity is 1.025, coral pro salt and RO water used. Am I worrying to much about nitrates? My Ph is 8.0, ammonia .5 ppm, nitrites 0 ppm, tests done using API test kit. TIA