Pineapple Thai Stick OG leaf issues

[Millwright]

Brother Mendels auto flower, 3 weeks flowering, Gaia Green 444/284, Strawberry Fields "soil", worm castings, top dressed 3 weeks ago 284. Ph water 6.5 ish.
Raised lights to 20". Gave calmag yesterday. Leafs started showing problem about 5 days ago.

 

[Kungpow420]

It looks like you got a lock out, but I am not 100% sure. Did you test your mediums ph?