Where did my fertilized N/P/K go? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 06-01-2011, 06:47 PM Thread Starter
x2h
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Question Where did my fertilized N/P/K go?

So I am trying to start a new 75g tank. Filled with treated tap water, hooked up an XP1 and an XP3, threw in some Anubias, and then added NaHPO4/KNO3 (~ 1:6) into the tank. After a few hours tested the Nitrate = ~20 ppm and Phosphate = ~2 ppm. Added Seachem Flourish as instructed on the label.

In a few days plansts are beginning to decline quickly. Testing shows both N and P are down to almost 0 ppm. I added NaHPO4/KNO3 (~ 1:6) again. No improvement. All plants died or at least looked so. The N and P are again down to very low level.

What's going on? There seems to be a black hole in my tank that sucks all the N/P/K fertilized.
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post #2 of 7 (permalink) Old 06-01-2011, 06:51 PM
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The black hole in your tank that sucks all the N/P/K fertilized is the plants LOL
Increase the amount added until you find a level even with the demand.

This will change when the plant mass increases also.


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post #3 of 7 (permalink) Old 06-01-2011, 07:25 PM
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You need to dose at regular intervals to keep those levels from dropping to 0. Read the EI sticky and give it a shot unless you're someone who just wants to try and reinvent the wheel. It will make your life much easier.
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post #4 of 7 (permalink) Old 06-01-2011, 09:13 PM Thread Starter
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thanks for the hints. my real question is, after those few plants died and rotted, where did the N/P/K go? I thought when the leaves dissolved, the N/P/K would re-enter the water and become available and your test kit will indicate it.
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post #5 of 7 (permalink) Old 06-02-2011, 04:07 AM
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Some substrates absorb nutrients as well. Flourite and Turface will. The reason I chose Schultz's Aquatic Soil, besides being a cheapskate and not wanting to hunt for Turface, was its high CEC.
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post #6 of 7 (permalink) Old 06-02-2011, 06:36 AM
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Quote:
Originally Posted by x2h View Post
I thought when the leaves dissolved, the N/P/K would re-enter the water and become available and your test kit will indicate it.

Photo related; it's a human body shortly after death.

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post #7 of 7 (permalink) Old 06-02-2011, 03:08 PM Thread Starter
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Quote:
Originally Posted by Kathyy View Post
Some substrates absorb nutrients as well. Flourite and Turface will. The reason I chose Schultz's Aquatic Soil, besides being a cheapskate and not wanting to hunt for Turface, was its high CEC.
thanks for the hint! i have about 0.5 to 1 inch of pool filter sand as substrate. maybe they absorbed all my N/P/K...
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