I noticed a little yellowing on the tips of the leaves after adding nutes, leads me to believe that I need to hold off a little while longer on them. Seems that the FFOF combined with perlite, worm castings, and bat guano have more than enough nutes for a long while. If I am getting nute burn after only 21 days with 1/8 strength, then I think I am doing great on the current soil mix.