i would start out with 1/4 % and go from there cause u can always add but not take backi've used gh nutes i think there good but seems like a ford would be to say a bmw not sayin there bad but not the best by any means i have def noticed a diffrence when i switched to advanced nutes but to get bigger better buds and growth u do need more than the 3 part nute system sum might say not but i have seen a big diffrence when i have added the "extras" if u will