I have a 14 gallon Biocube and running the oceanic skimmer ,with 12 lbs of live rock and 10 lbs of live sand and it is about 2 months old. I am using Red Sea master test kit so I think it is pretty accurate. I use R/0 for the water changes. Which I tested for 0 Nitrates etc... I am also using Red Sea salt which is also Nitrate free. I feed formula 2 about every 3 days.(should I cut down feedings?) And I have been running at 20 on Nitrates everthing else is zero. I have been doing alot of large to small water changes(every 3-4 days)And It dont seem to help. For live stock i have 1 ocelleris clown, 1 fire shrimp, And about 6 crabs and 6 snails. I know the best way to eleminate Nitrates is to do water changes, is there any problem with doing a large water change? I just did one maybe 4 days ago, Or am i removing to much of the good bacteria and it never has a chance to break down the nitrates? I am planning on doing 1 today. I would love to get below 5 on trates or is this an unreachable goal? Or should I give it time and stop being paranoid? I worry about the inverts in the high level of Nitrates. Or is this not that high of a level and I should just leave the tank alone for a while?