10-25-2009, 04:32 AM
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One or two plants such as Didiplis diandra and Tonina sp, for example, are documented as having a preference to softer water. I have grown D diandra myself, and I have soft water with a very low pH.
The reality is, having seen many a planted tank run with liquid rock, plants do not care about pH, GH or KH. Some may say they struggle to grow Vallisneria sp in soft water, but if I can, so can anybody. Keeping plants is far simpler than some people will have you believe, and will go out of their way to try and complicate things. Give plants enough light and ferts and you will be successful.