Any idea what's going on ? The plants kept gr...

Hello buddy,I grew one last year.I had almost same thing at some point.It's most likely lack of N a bit but don't worry about it as upper part of plants look pretty healthy.Parts closer to the light always seem darker.You can try increasing nitrogene a bit.When you switch to 12/12 or else,keep giving N at that ideal dose for a few weeks into flower.I see you are going organic.Nutrients you use may have calcium and magnesium but if not mix some calmag in to your feeding.This plant is so N sensitive.Even if you give the minimum amounts it can have that claw looking tips.I would just add something like Fish Mix(biobizz) but it's very powerful so add only a little.as for purple branches,it's all normal.Mine had it also.Nothing to worry about,it's genetics.End product of this strain is extraordinary.just switch to flower and see whats going on.cheers