Nute burn or disease? (With Pics)

I have a few lowryder#2xAK47 females, which are opproaching their 6th week of flowering, and a few plants have some sickly looking leaves (some purple with yellow/brown spots, others are yellow- all fan leaves):









Im wondering if these are like this because of nute burn or something else? Ive been using all foxfarm products, growing in ocean forest. I use Tiger Bloom, Big Bloom, Beastie Bloomz and cha-ching...just the recommended doses. Could someone please help this noob out?

Thanks

Maybe a nute or ph lockup,
flush her man, should fix it.