Nitrite spike in a planted fully cycled tank - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 06-08-2019, 06:37 PM Thread Starter
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Nitrite spike in a planted fully cycled tank

My nitrites spiked after I did a water change (10%) today. Nothing dead in the tank. Trimming was minimal. I dosed some flourish nitrogen. Could this be it. My nitrates have been low and affecting plants. Any thoughts would be wonderful!
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post #2 of 5 (permalink) Old 06-08-2019, 08:33 PM
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Test your source water?
Dead fish ? Hate it when I know I lost a fish and can't find it in the tank


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post #3 of 5 (permalink) Old 06-09-2019, 12:38 AM Thread Starter
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I looked and everyone seems accounted for. Source of water was good. I have a 10G as well, not planted, and it’s fine. Hubby was the thinker and checked the water parameters out of the tap. I’m gonna clean the canister filter big time tomorrow. Flow is good but I feel like maybe if there’s some build up in it then it could maybe be causing the problem...maybe... :s
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post #4 of 5 (permalink) Old 06-09-2019, 10:38 PM
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Seachem nitrogen is a mix of potassium nitrate and urea. The potassium nitrate will not cause a nitrite spike. However Urea often does break down in a to first Ammonia, then nitrite, and finally to nitrate. Typically I would not expect most people to notice the ammonia and nitrite spike because they probably don't last long and since plants have a preference for ammonia that would be consumed first before you would see a nitrite spike. How big was the spike and how much did you add to your tank. The other possibility is that since the plant may have not been getting enough nitrogen they were a little slow consuming or the you may have lost some of the bacteria that process urea.

Most people with larger tanks just use pottassium nitrate and don't use urea
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post #5 of 5 (permalink) Old 06-11-2019, 12:41 AM
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Quote:
Originally Posted by Clearly_confused View Post
My nitrites spiked after I did a water change (10%) today. Nothing dead in the tank. Trimming was minimal. I dosed some flourish nitrogen. Could this be it. My nitrates have been low and affecting plants. Any thoughts would be wonderful!
Who even tests Nitrite after being cycled?
What are your Ammonia levels? (If they are 0 I would check Nitrite again).
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