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Old 10-03-2016, 06:31 PM   #1
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NH4, NO2, NO3 all too high for no reason

I've got a problem. I've had a perfect 450l aquarium for about 5 months with a great nitrogen cycle, all was perfect! Now last few days, all NH4, NO2, NO3 are way too high! I've cleaned all my filter (got 3) and changing water for 3rd day in the row and nothing helps, within 24 hour all are back to high levels. I've got a lot of fish, yes, but I don't think too many. What's wrong and what should I do???


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Old 10-03-2016, 06:51 PM   #2
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Originally Posted by dimitri320 View Post
I've got a problem. I've had a perfect 450l aquarium for about 5 months with a great nitrogen cycle, all was perfect! Now last few days, all NH4, NO2, NO3 are way too high! I've cleaned all my filter (got 3) and changing water for 3rd day in the row and nothing helps, within 24 hour all are back to high levels. I've got a lot of fish, yes, but I don't think too many. What's wrong and what should I do???


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Continue with the water changes. Add prime to the tank at 5x normal dose to trap the nutrients till your mini cycle stops.

Do not clean your filters all at once. Do it on a rotating schedule. One 1st week next the 2nd.

Mini cycles can occur after ph changes, too many fish added at once, over cleaning filters, stirring the substrate and more.


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