Growforsleep

@Matjf420, Hm, did you buffer your coco coir before planting? I added like 5ml of calmag per litre and soaked the coco two times about 24 hours each.

@Growforsleep, Thanks for you reply!! This is crazy, i've started using Dual part coco and i get cal-mag deficiencies i've never had during veg, if i mix nutes in anything less than 250 ppm cal-mag they develop white spots by the next day ;( i love the product and how the PH holds for 1-2 days but can't seem to get dosages right.

@Unc1e_Co, Yes, the 12 hours is only for photoperiod plants, this is an autoflower that doesn't flower based on a light period.

@Matjf420, No, apparently the DualPart has enough calmag to sustain it as per the instructions, but I did buffer the coco with calmag before planting as cocoforcannabis site suggested it. So in the end I didn't have any deficiency symptoms and everything went great.