Ya, that's why I tried to explain the difference between using
nutrients designed for hydroponics, and soil. I agree though, I would rather use the Cal-Mg supplement than Epsom salt if using a non hydroponic specific
nutrient. Speaking of witch, I have herd of people using nothing but
Tomato tone, though I don't know how strong they mix it. It looks to be a organic nutrient with beneficial microbes, so I assume the beneficial microbes break it farther down into a complete nutrient that includes enough of the micro-elements in the end. Also He didn't change the nutrient solution very often, but just adds to it. I assume that keeps the beneficial microbes breeding, and the break down into the needed elements continually ongoing.