I have. Look up Phosphorus deficiency, they get really dark green, almost bluish or purplish. I had signs of mg./cal and Phosphorus.... ended up being both and the plant couldn't get em because of my ph level. Not saying thats ur issue, just commenting on the dark green nute burn. Good Luck!I've never seen dark green nute burn!
When I think of nute burn I'm thinking of tips burning from to much nitrogen. . But yes I agree ph fluctuations can definitely lock out certain nutrients and make your leaves do funny things..I have. Look up Phosphorus deficiency, they get really dark green, almost bluish or purplish. I had signs of mg./cal and Phosphorus.... ended up being both and the plant cou.ldn't get em because of my ph level. Not saying thats ur issue, just commenting on the dark green nute burn. Good Luck!