Nutrient and Alk increase when a tank matures

arking_mark

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So I have a theory on why some tanks see an increase in Alk and nutrients when they mature.

My tank is just about a year old. Prior to this month, Alk has been pretty consistent and nutrients running very low.

This month my Alk and nutrients have started to rise.

My theory:
  1. Substrate and rock have finally absorbed their fill of PO4 --> increase in nutrients
  2. Abiotic precipitation of CaCO3 is reduced as rock and substrate surfaces are now well poisoned with PO4 --> increase in Alk
Thoughts?
 
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Dan_P

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So I have a theory on why some tanks see an increase in Alk and nutrients when they mature.

My tank is just about a year old. Prior to this month, Alk has been pretty consistent and nutrients running very low.

This month my Alk and nutrients have started to rise.

My theory:
  1. Substrate and rock have finally absorbed their fill of PO4 --> increase in nutrients
  2. Abiotic precipitation of CaCO3 is reduced as rock and substrate surfaces are now well poisoned with PO4 --> increase in Alk
Thoughts?
Could be a coincidence.

#1 looks right. Aragonite surfaces probably become saturated with PO4 and PO4 in water subsequently increases. But what other changes occurred in the aquarium? increased stock? Increased feeding?

#2, not sure about.

Check back in a year and see if the conjectures still makes sense :)
 
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arking_mark

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So with the uptick in nutrients I've started dosing DIY NoPox:

500ml distilled white vinger
375ml vodka
125ml water

Measured Level (ppm) ....................Daily Dose ml/100 L (25 gal)
NO3 above 10 ---------------------------------------3
NO3 above 2.5, but less than 10 ------------------2
NO3 above 1 but less than 2.5 ---------------------1

Screenshot_20211128-213806_GHL Connect.jpg


I'm dosing 4ml to my 400L which is about 1/3rd the recommended dose. In 3 days, I've see a drop from 15.8ppm to 11.3ppm NO3, and a drop from 0.13 to 0.10 P04.

I'm pleasantly surprised this is working.

I'll continue to monitor to ensure nothing bottoms out.
 
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Randy Holmes-Farley

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So I have a theory on why some tanks see an increase in Alk and nutrients when they mature.

My tank is just about a year old. Prior to this month, Alk has been pretty consistent and nutrients running very low.

This month my Alk and nutrients have started to rise.

My theory:
  1. Substrate and rock have finally absorbed their fill of PO4 --> increase in nutrients
  2. Abiotic precipitation of CaCO3 is reduced as rock and substrate surfaces are now well poisoned with PO4 --> increase in Alk
Thoughts?

Those can both be true, certainly, but I do not know if it is the explanation for the observations a few folks have of alk rising. It explains a reduced demand, but not a rise.
 
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Those can both be true, certainly, but I do not know if it is the explanation for the observations a few folks have of alk rising. It explains a reduced demand, but not a rise.

The rise is due to dosing Kalkwasser and not reducing the drip as demand went down
 

Randy Holmes-Farley

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The rise is due to dosing Kalkwasser and not reducing the drip as demand went down

Then yes, that is a possible explanation. :)

Other things reduce demand as well, such as organics coating calcium carbonate surfaces, reducing precipitation.
 

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