I've got white widow going which I've read it's a real drinker of these, in fact, I think I need mag just as I enter veg. I do Epsom salt and garden gypsum in my water and last week, as soon as I saw the pre-for for the main cola established, added in molasses as well. No sign of burn yet, fingers crossed. I'm on my first grow as well. You might get more traffic if you set up a grow journal in the new growers area.
As an aside, I've read you can't over do CalMag, but I wouldn't want to test that theory, either.
Looking good, bro!