I like the General Hydroponics Flora 3 part mix. If you are going to use other nutes that aren't so clearly labeled in regard to their schedule related to growing weed, I always recommend something along the lines of 1/4 strength every other water, and keep a close eye on what the girls are asking for. They have pretty clear instructions for all stages of growth. I would heed any directions on your soil in regard to how long the pre-existing nutes last if any, and wait til they run out before adding anything to full strength.