[APD] RE: K+ and Color

["Rachel Sandage" <rachelsor at hotmail_com>]

I don't think the color is a case of the K inhibiting the CA uptake. When I 
switched to CaCO3 from equilibrium I did see a greater amount of color in 
the plants, but experimentally I'm inclined to believe it is from a lack of 
Mg, not Ca. After about a week and a half of GH coming almost entirely from 
Ca, I got some MgSO4 and added it, and the color diminished. I would have 
continued to go short on the Mg, but some plants, notably L. brevepes, were 
starting to show some stunting.

As for the K building up over time, I don't think it would. Some weeks back, 
several people went and actually did the calculations to show how much 
buildup there would be if you overdosed a nutrient, assuming 50% water 
changes. It turns out that the concentration levels off fairly quickly, even 
assuming little or no uptake of the nutrient by the plants. Since I tend to 
do more like 75-85% water changes, the buildup would be essentially 
non-existent.

-Rachel

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