It's great your learning about growing this fickle plant. I'd pick a line (cal/mag brand, ect) of nutes and only buy their products. Mixing different lines can cause isdues with over/under feeding. Don't just throw everything you find at your plants or soil. Get a plan (fox farm, advanced nutes, ect) and you will be far more successful. But you moving the correct way. Great job.
Sent from my SPH-L720T using 420
While I generally will agree with sticking with a single line of nutes, I believe Cal-Mag is an exception. MANY of the leading brands do not carry a Cal-Mag supplement (that I'm aware of!). For example, I don't believe Fox Farm, which you mentioned, even has a Cal-Mag, and I'm not aware of one from Dutch Masters, either, etc.