K-L-N is a root-growth stimulant, not a fertilizer. it may be used as a fertilizer additive at a rate of one or two drops per gallon.
The "Grow" is a very good, general purpose fertilizer. I recommend that you use it at a rate of 1.5 teaspoons per gallon, three out of four waterings, with the 4th being plain water to flush residues from the medium.
The mag-pro is a good way to increase the magnesium supplied to your plants. About once a month, I would use it instead of the Grow at a rate of about 3 teaspoons per gallon. When it runs out, don't replace it, but add about a teaspoon of Epsom Salt per gallon of fertilizer, once a month, instead.
There is no problem storing unused fertilizer, but the K-L-N may deteriorate, so you'll want to add a drop more before the next use (if that's more than about a week or so).
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