Shagrathanswered grow question 5 years ago Hi!
That looks like the beginning of Calcium, Sulphur or iron deficiency but it's still so early on that its nothing to worry about. You can keep checking the girls and see how that continues 'cos most of the time most of the deficiencies heals itself if you know your soil/hydro conditions are right. Sometimes small changes in enviroment could cause slight deficiencies but you don't need to react to everything.
Relax, don't worry and roll a joint!! 👌