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Since you are using RO, adjust the KH to 3 using only the alkaline buffer.
Adjust the GH to 3-4.
50% weekly water change

Add:
KNO3: 1/2 teaspoon3x a week and some PO4(about 0.5ppm) 3x a week the same day as the KNO3.

Add Flourish: 15mls 3x a week on the off days.

That's it.

Everyone was right about PO4 BTW.
You can see the NO3 uptake decline.
You can read about this in TAG and AquaPlanta(if you read Italian).

Regards,
Tom Barr
 

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C_perugiae said:
I'm still confused. Why is it a problem to use the Acid/Alkaline Buffer concoction?
BTW, I really do believe it was the PO4 now. The tank ate another 4 ppm of NO3 in the last two days, just from adding 5mL of Flourish Phosphorous to the tank.
I haven't changed anything else in my dosing habits.
You should not be the least bit confused, I said add only alk buffer.
Just do this and do not use acid "buffer".
Why?

Simple, plants want a certain amount of CO2, not a pH.

Plants want CO2, not a certain pH.

So you need to add precisely what the plants want and need to grow, not acid buffer which does not have any CO2.

If you need more CO2, then add more CO2.
This is deceptively simple.

The small amount of PO4 present in the Flourish PO4 is very small.
You can add 2-5x this amount.
I suggest KH2PO4.
1-2lbs will last a few decades for most.
www.gregwatson.com sells it for 3-4$.

Regards,
Tom Barr
 
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