Calcium, lock out?

The spots look like cal mag problem. Could have been caused from a bit ago. Your leaves look like they have a nitrogen build up, dark and shiny leaves. You may have been running slightly to high a level of N when you was in flower and this may have caused the other problem. I would flush and just drop the grow. Use half micro to bloom nutrient. So if 1ml micro 2ml bloom. I would also say your a while away from starting your final flush.