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The KH of my tap water is 2.8dH and the KH of my tank is 1.7dH. I've been monitoring my pH and unsurprisingly its not very stable and tends to drop pretty quickly. I'm going to try raising the KH in the tank using the baking soda method but was wondering what is a good KH value for me to aim for? I want the pH to remain stable and at the same pH as my tap water which is 6.8.

I also tested GH and its 11.2dH in the tank, but my tap water is 7.8dH so really don't know whats going on there!

The tank is a 15gal with ammonia 0, nitrite 0, nitrate 5-10ppm, pH 6.2 (but very unstable), temp 25C. Its been up and running about 6 weeks.

I am keeping tiger barbs and zebra danios.

Hi,
Generally we try to maintain a KH of at least 3 degrees and
a value between 3 and 6 is good.

Frank


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