spotted leaves and brown dry leaves

Alright so these are skunk #1 plants i have 2 bushy ones that are over a month old and one in a hempy bucket , but im having the problems with the the 2 bushier ones they have pale yellowish leaves and some spotted ones and some brown ones, its whack, i measured the ph of the runoff and it was around 5 so i flushed with water that i raised the ph to around 8 , thinkin it would raise the ph of the soil so when i measure the ph of the runoff it was actually lower so here some pics. any help appriciated

that last pic looks like a Mg deficiency

Cal/maf def ...use Epsom salt or buy organic