First: Blueberry, Cream, Mango CBD Autos

This week the blueberry exploded with growth. It's spreading out and covering the other two plants. It's a little droopy in the picture because I photoed it after it was in the dark for six hours. Even with its rapid growth this week, overall, the blueberry lags behind the critical mango CBD and the cream plants which are flowering. There's also a little bit of brown on the upper fan leaves indicating a possible Mg deficiency. Until recently, I've had a very conservative nutrient solution. I've increased the Mg from 2.5ml/gal to 4.0 ml/gal which is well within the limits others have used with good results. My total ppm is still less than 1000.. I've been having problems with my ph meter this past week so bought a new one. When I compared the two within a specific standardized ph solution, the meter I was using was off by .3, meaning, I've been using water that's at about 6.1 instead of 5.8. I'm not sure how long, but I calibrated it a couple weeks ago. Moving forward I'll see if this helps. I just received some Armor Si (silica) to add to my mix. Next time I'll use it throughout my entire grow. Otherwise, the plants are doing well. The cream and critical mango are stacking buds on their main cola and the branch colas are starting to form. Trichomes are forming on the flowering plants.