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Old 12-03-2010, 08:47 AM   #1 (permalink)
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Default High Nitrite levels in cycled 75g tank

I have a 75g tank, with a fluval 305 filter. there are 11 fish in tank (small). I have been adding the fish slowly. My nitrite levels are rising in the tank. I have cycled the tank, done 40% water change and vacuum the tank on opposite weeks.(I don't vacuum the whole tank at once) I add special blend to the tank every 2 weeks and after water change. I am worried about my fish. What can I do??? Thank you for your assistance.
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Old 12-03-2010, 09:46 AM   #2 (permalink)
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Default Re: High Nitrite levels in cycled 75g tank

Nitrates are present only because the nitrate consumers are not keeping up with the nitrate producers. Producers are your fish. Consumers are various form of plant life like algae in live plants.

Got good thing is that nitrates are not all the harmful to most fish.

the "bad" thing is that weekly water changes will still result in nitrates. With larger changes resulting in less nitrates but nitrates all the same.

It is entirely possible to have nitrates that max out the api test kit (160ppm), still have healthy fish even with filters and water changes.

If you have sufficient live plants, nitrates can esentually be 0 regardless of the filters and water changes. If ammonia bumps up (because something went bump in the night) the live plants will "switch" to consuming that ammonia preventing dangerous spikes. But at the same time nitrates will bump up instead. So you "exchange" a dangerous ammonia spike for a much safer nitrate spike.


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Old 12-03-2010, 10:12 AM   #3 (permalink)
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Default Re: High Nitrite levels in cycled 75g tank

Nitrite or Nitrate??

I agree with bob. For laymans terms, it is either because your tank has not finished cycling or your tank cannot keep up with your fish's bioload.

What you can do is, add fast growing plants like Elodea (Anarcharis), you can get them at petco. They grow and multiply very fast. Or can you just continue what you are doing, your weekly water change schedule. The thing is, if you add plants then you can do less water changes, cause they eat toxins from the water. No plants = more frequent water changes. Both ways work.
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Old 12-03-2010, 10:27 AM   #4 (permalink)
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Default Re: High Nitrite levels in cycled 75g tank

Woopsies I read wrong.

In tank where I didn't have plants and was experiencing a nitrIte spike I stopped adding food until the nitrItes went down. that lets the bacteria catch up and the nitrItes remain at 0 after that spike.

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Old 12-03-2010, 11:43 AM   #5 (permalink)
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Default Re: High Nitrite levels in cycled 75g tank

How long has the tank had fish in it? 11 small fish in that tank with high nitrites doesn't even sound possible unless it is still cycling. I have close to 80 fish in a 75gal tank and no problems with anything.

How high is high? What is the ppm?

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Old 12-03-2010, 11:51 AM   #6 (permalink)
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Default Re: High Nitrite levels in cycled 75g tank

Almost sounds as if your tank isn't fully cycled. 11 small fish in a 75g isn't going to add much bioload. Have you changed out the filter media?
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