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I wouldn't worry too much about a KH of 8. Where I live, that's
considered soft water! My water has a KH of 17 and a pH of 8.2. With CO2, I
lower the pH to around 7.2. The plants are doing well for the most
part. I've even been able to grow respectable Eusteralis stellata, which I
was told required soft water to survive. I plan to mix RO water in the
future, but this is more for the benefit of some species of fish I'm
interested in keeping than for the plants.
I hope this is some help, or at least encouraging to some degree.
>From: Aquatic-Plants-Owner at actwin_com (Aquatic Plants Digest)
>To: Aquatic-Plants at actwin_com
>Subject: Aquatic Plants Digest V4 #19
>Date: Mon, Jan 10, 2000, 3:48 AM
> I accidentally mixed up a bag of gravel from a
>different source when I setup a new tank, and the bag contained some sea
>shells, all crushed up into little bits. As a result, my normally soft
>water now has a KH of 8 and PH of 7 and this is with a constant flow of
>bottled co2 being pumped in. I guess if I stopped the co2 the KH would go
>even higher. Would you do anything else to lower the KH? The plants are
>just starting to kick in and seem to be growing well except for the Bacopa
>Longifolia, which has put out new leaves, but they seem to be stunted. The
>tank is about 3-4 weeks old.