Top leaves brown spotting!

Hi all, hope someone can help me here, the top leaves are getting some brownish purpleish spots and are yellowing a bit. Soil grow, b'cuzz nutrients and combo lighting of cfl & led. Thinking it may be calcium as i added epsom salts about 2 weeks ago, and am using bottled water as the local taps are pure calcium and last grow had a lock out isse.

looks like a calcium related lockout, tis possible your adding the Epsom (Mag) caused an imbalance. Have you done a flush?

I have, do you think i should water with some tap water to give it some calcium?

If you have flushed, I'd wait a few days watching new growth to see what happens