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[APD] RE: NO3 uptake

I think a good max rate is perhaps 3-4ppm of NO3 for a planted tank. That's
a lot. But realize poor test kits, variability in plant species needs also
varies a great deal.

Hair grass might be alright at low(1-2ppm) NO3 while Eustralis and Mic
umbrosum might prefer higher(15-20ppm).
Also, you have to consider fish feeding and loading. With 12 Discus vs a
few otto's and shrimp will make a difference.

I think many folks that have gotten the CO2 down well and still are having
trouble fail to add enough NO3. I am thinking the test kits are poor, the
NO3 being test might be other non available forms of NO3, and that folks in
general should add a bit more NO3 if they are having trouble.

I'd have to say with CO2 enriched tank, the two biggest issues are CO2 and
then NO3. Almost always not enough and/or poor measurements.

Tom Barr 

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