Hybridanswered grow question 6 years ago That looks like the early symptoms of a Calcium deficiency. Make sure your pH is between 6.0 and 7.0 for a soil grow and try a Cal-Mag supplement. You also have 40% Relative Humidity - this is a little low for a young plant in veg so try and raise it to 50% or even 60%.
Don't worry too much though - in general your plant looks nice and healthy