I have bought Bicarbonate of Soda so that I can raise the KH, but if I add it, it will also raise the PH. If I add more co2 to bring the ph down, will the kh decrease too, ending up in a endless cycle?

Last time I had checked the kh of my tank, it was stable at 6dkh and I was running at about 20ppm to 25ppm co2. One thing I have done lately was to double the amount of light I have over the tank, ending up with 152w of light, around 3wpg.

I have took a sample of my tank water, left it 24h to standby, and after I checked the ph, it was at 7.65, dont know if from this you can calculate the co2, but I have read it somewhere in these forums.


Below are the water parameters as of this morning, is it possible that the KH is crashing cause I am reducing the PH so much?

Tap Water Parameters

PH 7..5
KH 6
GH 17

Aquarium Water Parameters

PH 6.5
KH 1
GH 16