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Water hardness levels

I just finished reading an article called "General and Carbonate Hardness"
by Albert J. Thiel. In this article he offered "suggested levels for
hardnesses" in tanks:

	"Freshwater fish-only tanks  -  dKH or carbonate hardness: 7-8
					  General or total hardness: 4 to 5

	 Freshwater plant tanks         -  dKH or carbonate hardness: 3 to
max. 5.5/6
                                                              General or
total hardness: 2 to 3 maximum"

My question is: if the above is to be accepted, how does one adjust for a
plant tank WITH FISH?

Thoughts anyone?