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:
AnomanderRake Reviewed by AnomanderRake on . Fert burn or K deficiency? Hello growers! :) This is my first post here in this great forum. I've been reading a lot and started my first grow, and until now I had no problems. Last week two of my plants started to develop burn tips on some of my lower leaves. It quickly spread to most of the leaves, some with more intensity and others with less. I read a lot and saw loads of pictures of problems and deficiencies, but could not deicide if this is a Nute Burn or some kind of deficiency (Potassium?). It's hard Rating: 5