Nitrate spike - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 07-25-2018, 05:52 AM Thread Starter
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Nitrate spike

Simple question, can over fertilizing cause a nitrate spike? I noticed alot of algea so i bought a new test kit (my old one been expired for 2 years..) and tested the nitrate and found it alarmly high. Dont know why when i 50% wc weekly and my fish laod is that huge. Only thing i can think of is to much fertz. Most of my plants are slow growers like crypts. (None of my fish were harmed... just noticed alot of algea)
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post #2 of 5 (permalink) Old 07-25-2018, 06:06 AM
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Of course: if you add a lot of N then you end up with a lot of N.

A spike is different. If your fertilization has not changed but N jumps then it's a spike.
Good time to check N in your water supply with the new test kit.
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post #3 of 5 (permalink) Old 07-25-2018, 11:06 AM
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Robo...

How high are the nitrates? Since this form of nitrogen is at the end of the nitrogen cycle, it isn't especially toxic to fish. It would have to be in the 80 ppm range and remain there for several days, before the fish would begin to feel the effects. Large, weekly water changes of at least half the tank's volume should maintain a steady water chemistry and this is all the fish require.

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"The fish keeping hobby is very simple. Just change out a lot of water, a lot of the time!"
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post #4 of 5 (permalink) Old 07-25-2018, 07:23 PM Thread Starter
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Quote:
Originally Posted by OVT View Post
Of course: if you add a lot of N then you end up with a lot of N.

A spike is different. If your fertilization has not changed but N jumps then it's a spike.
Good time to check N in your water supply with the new test kit.
Inhave been using a test kit that was giving me zero readings... so i dont know how long the nitrate has been hight. I am assuming that i have been adding to much fertz and the weekely water changes havent been taking enouph out of the water causing it to accumulate higher and higher each week... think that makes sense?

Cant imagine it being caused from an amonia spike cause i havent suffered a fish loss in months
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post #5 of 5 (permalink) Old 07-28-2018, 04:28 AM
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Quote:
Originally Posted by Robo-snickers View Post
Inhave been using a test kit that was giving me zero readings... so i dont know how long the nitrate has been hight. I am assuming that i have been adding to much fertz and the weekely water changes havent been taking enouph out of the water causing it to accumulate higher and higher each week... think that makes sense?

Cant imagine it being caused from an amonia spike cause i havent suffered a fish loss in months
How high is alarmingly high? 80 ppm? Even a brand new test kit is not all that accurate.

How is your tank hygiene? Do you clean the filter regularly, vacuum the substrate, and trim dying parts of plants?

Algae is not due to too much nitrates. It's most likely high organics and lacking other nutrients your plants need to be healthy.
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