spots on Purple Urkle

Any ideas what causing these spots on leaves? Bottom leaves are photo 1, and other leaves are photo 2.

Indoor
Water auto drip, 2x day
rockwool, GH 950ppm 5.7-6.1 ph
early veg, 9 days from clone

Thanks guys!

Looks like pH spotting to me. Maybe a little salt build up... but mostly just pH damage. Could have been from a little while ago.

You should ensure your pH sticks closer to 5.7 to 5.9 and definitely calibrate your meter soon.