I'm just a newbie, but a kind of advanced one. I agree with everything said so far, just wanted to add a little info.
FFOF burned all of my clones, I learned the hard way to start them off with something lighter, like Fox Farm Light Warrior for instance. Once they get a good root system going and have to be transplanted, that's when you want to put them in FFOF or something stronger like that.
Hope that helps some.