I do, but I learned the hard way that if you feed it at the recommended dosage, you'll burn the crap out of your plants...Hey do you use that "bud explosion" also by Greenleaf with mega crop?
The dosage on the bag says 1-1.5g/gallon, but the most I'll use now is .25g/gal.- and the only reason I do that is because I've got a bunch of it to use up.
Actually, Mega Crop alone has everything the plant needs, so there's really no need for any additives-save your money...