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 in 3gallon pots. I prefer a dryer mix and can water more often when needed. Its easy to take care of such a small grow room when it comes to watering/feeding so the light soil works well for me and is a bonus at flushing time.
Other than the little yellowing of lower baby leaf, the plants are very stout and study. The main stalks are quite thick for such small plants. I had 6inch fans blowing on them since the 2nd weeks so Im sure that helped.
Video added and 2 pics