nitrates still high - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 11-30-2015, 06:14 AM Thread Starter
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nitrates still high

So I had high nitrates in the 75 last week in the 80-160 range. Today it was in the 160+ range. This is with the api test kit. I did a 20-20% water change and it lowered it to the 80-160 range again. I did another water change in the afternoon and it is still showing 80-160. When I test my 29 it shows 5-10 range so the test kit does seem to work and I did not get to calibrate it yet as I need to get the potassium nitrate which I have to order. How pure does the potassium nitrate need to be? I've seen it advertised as stump remover and it was 99.5%. What is the a reason the nitrates don't seem to go down? I'm going to do another water change tomorrow. Is there anything else that can lower it? What are the major contributing factors to that high of nitrates?

The tall plants in the center and left side seem to grow a couple inches a day and my other plants are finally starting to show growth. This pic is from today.

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post #2 of 8 (permalink) Old 11-30-2015, 09:44 AM
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Your water changes need to be @ 50%.
They are staying high because the caw thing is releasing ammonia and that is being converted to the nitrite which is then converted to nitrate by the second bacteria.
Until the ammonia stops being leached into the water by the fert you used it will
continue to do this.
If you do a 50% water change and then check the nitrates, then test again each day to see how fast they come back up, you can find out if you can skip a day in between the water changes.
I can't account for why this hasn't happened in the past with this fert you are using.
But just some dirt subs do this and the tank owners just ride it out. Usually when setting up a new tank without critters in it yet.

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post #3 of 8 (permalink) Old 11-30-2015, 07:22 PM Thread Starter
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So the ferts are causing this? These are what I'm using.



Is continuing to use these going to keep the nitrates high?
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post #4 of 8 (permalink) Old 12-01-2015, 03:02 AM
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Your plants, as you say, are just starting to grow. You are feeding the fish too - that adds macro and micro fertilisers too. I would lay off dosing macro fertilisers for at least 2 weeks and micro fertilisers for at least 4 weeks. Your water changes and fish food should be sufficient to fulfill the nutrition demands of your plants for the time.

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post #5 of 8 (permalink) Old 12-01-2015, 03:17 AM Thread Starter
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I forgot to mention that I also put some osmocote pills in there as well. I have maybe 4 or 5 spread throughout the tank. Will that cause any problems. I did 2 more water changes today and got the nitrates down to 80 but getting on the lighter side.

75g planted, 100 watts light, co2
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post #6 of 8 (permalink) Old 12-01-2015, 03:50 AM
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I had osmocote tabs raise nitrates before, how big were they? How well buried were they?
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post #7 of 8 (permalink) Old 12-01-2015, 03:54 AM
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You will not be able to anything about those root tablets now. Just lay off over-fertilising your tank. No dosing for an additional 2 weeks and keep up the water change routine.

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post #8 of 8 (permalink) Old 12-01-2015, 06:02 AM Thread Starter
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the pills were pretty big, probably over 1/4" in diameter. I made sure they were covered up good but i think I did see a couple of the little balls above the surface after doing a good tank cleaning. Would I be better off not using the root pills anymore and sticking with the liquids after this clears up?

How long do the osmocote pills last? I put them in maybe 2 weeks ago

75g planted, 100 watts light, co2

Last edited by Darkblade48; 12-01-2015 at 08:02 AM. Reason: Please use the edit function for back to back posts
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