I am using API test kit and I know that is not the most accurate. Nitrates have been off the chart but came down this week a little. Phosphates have also been off the chart. Put a Phos-gard bag in the sump on Sunday. I have a large custom sump with 2 filter socks and a model 300 Top Fathom Skimmer. There are 7 fish, 2 eels, and an anemone in the tank. They are fed Formula II pellets in the AM and some sort of fish product in the evening - silversides, brine, mysis, Rogger's. I am trying my best to not overfeed but these are all very mature fish and I want to make sure they get enough. They are eating everything I put in the tank within about 20 min. One of the eels I can handfeed.