Rainsoft water softners exchange hard water chemicals for those which are common salt, Sodium Chloride so you get water which is as salty as it was hard. This is not necessarily a bad thing depending on how much hardness or salty there is in your water, and you didn't say.
The RO unit removes all the ions in the water, the salt, in your case. So the water you have out of the RO unit is almost pure rain water or distilled water with no ions. Hardness ions in the well water will tend to buffer the pH changes brought about keeping life forms in the water, feeding, excreting and breathing etc.
One in your case needs to balance the two water qualities 1. the hard well water and 2. The pure RO water.
Experience will show the way. Sharp pH drops in small tanks will kill fish quickly due to the acids generated. Sharp rises in pH will kill fishes due to Ammonia released from waste, etc.
I would start with 1:1 well water to RO water, and see what happens with a well populated tank of fish and go from there.
C. H. Harrison, Ph. D.
319 Martigney Dr.
Mehlville, MO 63129
http://www.inkmkr.com/Fish
http://www.InkForYourPrinter.com
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