Tank going through NO3 like butta! - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 01-29-2004, 05:59 AM Thread Starter
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I guess this is a good thing. I dosed about 5 ppm of KNO3 last night after some maintenance. I did a check about 24 hours later, expecting at least 2 ppm NO3. To my surprise, there wasn't a bit of NO3 left :shock: .

On the otherhand, the 1 ppm of PO4 was still there :roll: . I thought that plants would consume the PO4 while using NO3? Guess I was wrong?

Anyhow, I'm gonna up my NO3 dosage to 10 ppm after water changes, hopefully it'll give me some lead time .
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post #2 of 5 (permalink) Old 01-29-2004, 12:14 PM
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First suspect the test kit. Second be careful. It could be that the plants were starving for nitrates and once they get satisfied the uptake will drop off.
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post #3 of 5 (permalink) Old 01-29-2004, 12:20 PM
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Plants don't take up P as fast as they take up N which is why the recommended ratio is 10 to 1. If you have a source of P in your substrate, it's possible that as it is drawn from the water column more is being liberated from the substrate. Assuming your test kits are good, keep testing and let us know what you see.

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post #4 of 5 (permalink) Old 01-29-2004, 01:44 PM
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I started dosing about a little more than a week ago. The plants were sucking up the nitrate as quick as I was putting it in. I wasn't even getting a substantial reading. Finally it all caught up and I got a reading of 8 ppm one morning. That evening when I got home it was down to 4 ppm. It has slowed down since then. I guess the plants were starving.

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post #5 of 5 (permalink) Old 01-29-2004, 05:46 PM Thread Starter
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Quote:
Originally Posted by Rex Grigg
First suspect the test kit. Second be careful. It could be that the plants were starving for nitrates and once they get satisfied the uptake will drop off.
I thought it was my test kit too so I tried it out in a 1/4 gallon jar, it worked. Also, I just realized that when I used Chuck's Nutrient Calculator the first time around, I didn't change the "tank size" choice to 100. Basically, I've been dosing enough nutrients for a 50 gallon tank :roll: .

So I think it's probably because my tank is starving. I just dosed another 6 ppm this morning, so I'm gonna check it out later tonight.
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