Thanks for the reply, Shake!

Good to know it's not fert burn. One less thing to worry about!

About the humidity, I have an dehumidifier inside the room and even this way I can't lower it more. Do you think this can be my problem? Which humidity should I target?

Someone said in another forum that my PH is to high and I should lower it to about 5.5 . Do you agree? (always thought that ideal PH was between 6.0 and 7.0)

About my lights, here in my country it is very standart to use it on the veg stage... Which one do you recommend?

I'm posting some more pictures of the two porblematic plants fo you to judge the sizes and the problem better.

Thanks again for the help! :smokin: