Ignite if you want to really find out about FF product lines go to their website and visit the FAQ's link. Basically though if you're growing outside where you're mixing soils use the Happy Frog. If it's an inside grow FFOF is about the best. As far as adding nutes some will tell you to wait until week 4 or 5 to add nutes to the Ocean Forest. I just hit mine Sunday with a 10mL/gal mix and they did just fine(they are 3 weeks into veg.) If you use Happy Frog mix you will have to add nutes sooner because the soil is a little weak in Nitrogen.