First coco grow with Fastbuds

Day 16 - The slow growth I noticed last week was caused by the lack of base nutrients, as I suspected in coco is very different than in soil. For the next runs I'm going to buy Vitalink PlantStart in order to feed 'em by the very first days without the worry of overfeeding. Now the ladies are doing great and loving life! Still feeding them 1 time per day until they will be big enough to begin feeding 2 times per day. Day 17 - Today I noticed the beginning of what I think is a Calcium deficiency on the first leaves of Gorilla Cookies. I have cut the CalMag Xtra 5/6 days ago, when I started with base nutes, because a guy I follow who have the same line of nutrients have to use it only the first 2 weeks. So, I re-added it to the mix at 1ml/L and adjusted pH at 6.0 in order to fix the deficiency. Now the PPM is a 750, hope the roots are big enough to take it without burning.