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[APD] KH, pH and CO2

Just a follow-up to my CO2 dilemmas.

I added 2/8ths of a tsp of Sodium Bicarbonate to the tank which has raised
the KH to 70ppm (from 40ppm).

I left the CO2 in overnight like I did the previous night and the pH stayed
at 6.6. (phew).

So this afternoon I'm going to run the CO2 into the powerhead intake and see
if the pH drops.

Is 70ppm KH (3.93 deg dH) a reasonable level? Or should I whack another 1/8
tsp in this afternoon?

After this stabilises I'm going to go on a weekly testing regime.


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