I have a new 46 gallon tank with about 45 pounds of live rock that I have been running for about 7 weeks. The rock was pretty well cured when I put it in the tank so I have never seen the spikes in my tests like everyone has mentioned. In the last few weeks I have added a cleanup crew which consists of a brittle star, some turbo snails,peppermint shrimp, sea urchin, sea slug, flame scallop and prociline crab as well I have an anemone ( at least thats what I think it is). I do %10 water changes with RO water from the ls store once a week. Everything in the tank has been doing nicely but I cannot seem to get my nitrate levels to 0. I keep testing and it has been 10 since about 1 week after I started the tank. Everything else( nitrite, amonia), has remained at 0. What am I doing wrong? As well I seem to constantly struggle with my ph, it likes to sit at 7.8, if I add buffer then it will head up to 8.2 but I don't want to keep adding chemicals if there is a natural way to up PH. My main concern is the nitrate, I don't want to add any fish until I can get it under control.I would appreciate any suggestions as I know there is so much to learn and obviously I'm doing something wrong!!