Yellow leaves from bottom

Thank you all for the help, i'll try to feed them.

Start to feed them every few weeks now. Dont go over board on the feeding, your better off using weaker mixes more often instead of stronger mixes less often. This is less likely to burn the plant and allows you to adjust the feedings easier as its hard to take out a bunch of nutes if you realize you have over done it. So use some weak nutes this week, maybe some weak nutes next week too and adjust from there depending how plant looks. Once you have fed them, snip the old yellow leaves off.

Die gelben Blätter mit den leicht verdrehten Blattspitzen deuten für mich auf einen Stickstoffmangel hin. Ich würde sie auf jeden Fall füttern =)

Agree with organoman- overall macros. Needs a good feeding, and continued feeding after that

Yes, start feeding them, these are signs of deficiencies of all macro nutrients, = nitrogen, phosphorous and potassium. Half strength nutrients are just fine for autos, actually cannabis in general. The yellow leaves will not recover, but all new growth will be ok. Hope this helps, Organoman.