Thanx for the reply Dave. I think I will stick to the two water changes a week, as you say, if the water changes were not so frequent then there could be trouble with KH and pH due to the biological processes. I was just a little concerned with the KH being low, I was always led to believe that it should be no lower than 4, but with a good maintaince regime, I guess not!
Thanx again!
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'Peace On Earth.....And In The Water'
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