What Is This Deficiency?

[coconewb]

day 12 of flower buds have started
ph 5.9-6.0
250ppm cal-mag 200 flora nova grow 400ppm bloom

have this showing up on leaves:

 

[coconewb]

transitioning to bloom only nutes on day 15

 

[Dutch Jon]

If its the lower or middle leaves it looks alot like Potassium deficiency is that posible? check your pH .. pH fluctuations you'll get that, correct pH should rectify most weird issues like that