Runtz fem - Eternity Grow Cup

Week 2 has been going alright, i noticed the first set of true leaves begun showing signs of calcium deficiencies, so i have recalibrated my ph pen and upped the calmag abit. Furthermore i have started feeding with plagron coco A & B and a drop of silica, at approximate 1.2-1.3 ec total. Im crossing my fingers that im past the deficiency issue by now, as the second set of leaves aren't showing any bad signs yet, and that the problem stemmed from either the ph being a bit off, or the coco hogging the calcium from the calmag.