Melanotaenia, thanks for your thoughts on this problem.
The water we have in Ohope, is the same as we have in Whakatane.
This is taken from our river, treated, and made "slightly" alkaline so as it is not"aggressive" to the reticulation system (pipes).
The river rises in the ranges to our south, which are in-general, forest clad, finally meandering through farmland to the sea.
This is is not a limestone area, so the water, before treatment is on the soft side.
I don't know where my figures from the treatment station are, so I cannot give you the exact target they aim for.
Maybe EJ, if he reads this, could give us a run-down of the water parameters, as he takes a close interest in this for his planted tank.
Alan 104