Keith wrote:

Actually, I wanted to get one for my fish as well. I prefer to keep
small rainforest fish, characins, cyprinids and lampeyes mostly. I
started to aquire some plants that seem to only do well in soft water.

That list is really short (less than 2% of all the plant species commonly kept in aquaria is my
understanding). The list of plants that will do POORLY in soft water is, to the chagrin of us sof****er
fans, much longer.