Nutrient problem

This plant is very tall was growing very well. However, it is now in about week 6 of flowering and the whole plant is affect by a problem where the leaf starts off with red dots and yellowing the progresses and dries up and and the leaf dies

Wow looks liker hey need some Mag

Probably a calcium issue. Need more info if you want advice. What growing medium?

I'm growing in soil. And the strain is blue mystic. It is my tallest plant by 20 inches. And the buds are very airy. Also about a week ago I added a lot of bloom nutrients because I thought it was a potassium phosphorus deficiency. Also the ph is about normal inbetween 7.5 and 6.5. Should I flush or add cal/mg nutrients?