The reason i went with fox farm int he first place was their easey schedule to follow. When i looked at advanced nutrients, there were so many different things to buy, i was so overwhelmed. So, i wanted to ask you experts, what advanced products should i buy? I had a suggestion that i need sensi a and b, and rhino skin, and thats all? Is that true? Also, what is the difference between the 2 part formulas and the 3 part? There is so may things to consider that i dont know what to do. Thank you for your help everyone...and happy growing.