help?? yellow and brown spots on leaves

hey guys

if you can help

week 1 of flower

canna newts
cal mag and magnesium is added
growers choice 720 LEDS
flood and drain hydro rockwool

why do my plants have some of these leaves?

Excess potassium in your feed.

hotrodharley said:

Excess potassium in your feed.

Click to expand...

p is below what normal feed is. thinking magnease

If it’s actually manganese the leaves would finish going to hell in a hurry. Good luck.