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Lowering KH

Greetings people,

I am after some practical advise on lowering the kh in my tank.  Tap water
is approx 5 - 6 deg and the water in my tank is 12 - 13 !!  I do a weekly
water change of 1/3 and when I first set the tank up it was at 8 or so and
has slowly continued to rise.  I have no rocks, only driftwood and gravel
(plants of course) and can't work out what is causing this to happen.

My major concern is at this kh level the amount of co2 injected to achieve
the desired ph level is quite large and I am only running a DIY setup.

Any advice??

Best Regards,