I noticed yellowing of the lower leaves a few days back and was kind of confused because in the past my PPM was fine for "small plants/seedlings". At this size there should have been no problems. What I did not account for was the underground root zone I was growing this time because of the "RAW" beneficial spores and bacteria powder I added.
Pleasantly surprised when I transplanted to 3gal pots from the red solo starter cups to see such a packed root zone!!!!
I powdered the roots with Advanced Nutrients Tarantula and stuck them into the final home base of ProMix HP mixed with around 25%Perlite for added lightness. I prefer a dryer mix and can water more often when needed. Its easy to take care of such a small grow room