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I have been testing my tanks for various levels ( ammonia,nitrates,nitrites)I have a couple of questions I hope someone can help me with.2 of my tanks have 0 ammonia levels,save nitrite levels,but high nitrate levels.1 of my tanks has 0.50 ammonia level,save nitrite level,but high nitrate level.Can anyone give me some advice on what to do and what might be causing this?These tanks have been established for a long time.The ph in all these tanks is between 6 and 7.I can get you an exact reading if that would be helpful.Thanks.