Does nitrates have anyting to do with the Xenia not pumping ? When i first got it they were pumping like crazy, now that i have fish and im feeding every other day my nitrates are detectable on my test kit, but barely. I do 20% water changes every other week, and everything stays in check. Would this have anything to do with them not pumping. Everything else is very fat and happy, coral and fish. Reading like a 2.5. 0 being lowest and non-existent, and 50 being the highest. Any feedback would be appreciated.