It has now spread to more plants...I am very concerned...not an infestation. I can spot that immediately with magnifying glass and my careful eye on the little girls.

I am using nutes...GH 3 part...added them last week in a tiny amount...just to stimulate stem and veg growth.

Please look at these pics and tell me what you think! Calcium, magnesium, am I underwatering now?

Thanks in advance...and please read this!!!!!!!