Ozy your theory is correct, and a source of kH is actually recommended in Natural Planted Tanks, where the philosophy is to never do a water change (see Diana Walstad's book for more info).
Greentree- IMO one of the
best things you could do is look for a local fish and/or aquatic plant club, and see what ppl around you are breeding and growing. Chances are if it's locally bred or grown it will already be acclimated to your water.
Otherwise, Ozy's right that most plant and fish can be acclimated to different parameters than those normally recommended if the acclimation is slow, and the new parameters are stable.
