It always amazes me how folks can take something that's ridiculously easy and foolproof and make it needlessly complicated. All to what end?
I use Jack's. Max concentration in veg is 1 teaspoon per gallon for feeding with every watering. To answer an older question, I use Pro-Mix (though, virtually any medium will do in a pinch) and Jack's. No additives, no magic potions, no improvisation, nothing mixed in. Some of the results are link'd in my sig.
As a rule of thumb for a
new grower, the more variables you introduce, the less your chances of success. Good luck.
Edit: Let me talk a bit about working with the stuff. Like I said, the product is essentially foolproof. Below is an example of seeds 2 weeks from sprouting after being fed with JC from Day-1:
As you can see, all the plants have 3-5 nodes within 2 weeks of sprouting. They're fed with 1/4 concentration of JC (ie/ 1/4 teaspoon per gallon) for the first 2 weeks, then the concentration doubles in the next watering, doubles again in the one thereafter, and then stays constant at 1 teaspoon per gallon.
Starting with a rooted clone: First watering is 1/4 concentration, then it doubles with every watering until max is reached. That's it.
That's how fucking easy this is. No variance at all. There's elegance in simplicity that translates directly into big yields.
Simon