I've been dealing with this type of symptom in my plants for some time now, all treated in the same way.
Some of them is going really good, others, not so much...
I'm treating them with organic fert, Epsom Salt each week...
Hi bro,
An Epsom salt overdose can harm plants.
We should know:
The type of soil you are using.
The amount of nutrients you are already adding to the feeds.
Solution:
Use clear, pH-balanced water.
And wait a week.
Good luck, buddy.
Hmm looks like they have burnt abit buddy light does not seem to high they look nice and healthy what you must remember each and every seed is unique even if harvested from the same mother plant so each strain will give off different traits even clones took from the same more are all unique plants they will be similar but they will all develop different traits as they grow some will finish sooner than others some wont its just all about the strains you choose and also the conditions in which you grow in. they all look healthy so I would not worry about it too much just give them time and Im sure they will come around :) best of luck buddy.