Shagrathanswered grow question 5 years ago Hi there!
It looks like potassium deficiency BUT it might be something else if the balance of nutes ios not right. You know best what you have been feeding to them so check mulders chart and pH to figure what could be wrong.
Basically too much N,P,Ca or Mg will result in K def and when I look at the color of the leafs there is slighty dark green so maybe you have too much N from veg in soil and now they don't want it as much?
Not certain but feels like it