Mg bloom booster has a more complete range of nutes only lacking Cal mag and sulpher.. the all purpose also has a soil penetrant? Whatever that is. And the bloom booster supposedly is safe on edibles( I wouldn't try it or smoke it though)
I'm assuming your using cfl, make sure about 2in away from plant. I believe 2100 lumens is required to sustain photosynthesis and the sun averages 7. So aim for 7,000 lumens per sqft.