Auto Skunk #1 & Auto Pink Grapefruit

Day Week 4 I'm happy because the plants have managed the deficiency or whatever issue that leaves wer starting to get chlorotic ( that got the three of them, Sensi Skunk and APG, the defect was more marked on the Skunk), I think it was a problem of the reutilized coco coir which was not completely buffered or pH issue, it looked like a Mg def, but I guess it's past history (though some signs are still shown on the older leaves). I fought salt build up with E, and I sprayed Cal.Mag (pH'd) water that seemed to be beneficial. Fertigation is once a day, EC is 550 ppm and run off EC is acceptable (Amounts per 6.25 L: Pro-silicate 2.5 mL, Cal-Mag 7.5 mL; Flower Power Grow fertilizer 0.2 pH 6-6.2 solution