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Old 08-18-2017, 03:11 PM   #1
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When to do water changes

Hi guys!
I have cycled my tank and now I am aiming to do water changes every 7 days but usually nitrates go over 20 by day 3 or 4. Can I keep it until nitrates reaches 40 or is this too bad?? I have a 20 galon tank with one plant and marimos and 2 small goldfish.
Thank you!
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Old 08-18-2017, 03:26 PM   #2
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It depends on the fish but I never let it go above 20 if I can avoid it. As opposed to more frequent changes can you change more water each time? How much water are you changing?
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Old 08-19-2017, 04:23 PM   #3
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I have been changing 69-70% every 3-4 days. I have added an extra plan today. I will keep that so it doesn't go too high. thank you very much!
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