Spots on leaves, white powder under

A week ago i did not add nutra mikro and had boron phosphorous and calcium deficiency. Today i was looking at the leaves and i noticed something that seemed to look like white round spots on top under white light. I thought it might be septoria so i plucked the leaf off to inspect it better and white spores of sort went flying through the air. Touching the bottom of the leaf leaves white stuff on fingers.

Indoor hydro. Week 6 since flip.

Probably downy mildew

Pics of whole plant.
Looks like calcium def..