Check out the Advanced Nutrients web site http://www.advancednutrients.com/nutcalc3public/ It works it all out for you. I started with Grow A+B, Sensizym, B-52, Humic Acid, Fulvic Acid and they grew fine. Ive brought a few other bits as latewood suggested Voodoo Juice and Piranha powder. They do some mad stuff to the plants, hope this helps.