Que le pasa en cada foto ??

Depends on your runoff ph, thats how you determine witch is the best ph water to feed your girls.

Que ph me recomiendan . Pongo 6,5

Be good if I could sew the diary. Part salt/tox/defs/deg/N tox/ micro/marco nute defs/toxs you got it all in spades bro. Clearly it's your mix that's the problem if all plants are showing these signs. Simplify it, focus on Bio grow 2ml/l top max 2ml/l bloom 1ml/l during growth Phase then flip the bloom grow on its head when stigma starts, 2ml/l bloom 1ml/l during bloom. Also if you are using soil. 1-2 feeds tops a wk, feeds need to be a part with the same amount of water in same PH range as nute feeds to stop if any PH swings causing nutenute lock. Also, mix it up even. If all plants are having issues then stop giving them all the same mix. Change it up. Drop bloom, till bloom or use it in smaller doses. Whatever way you are mixing giving you are causing nute lock. Without a diary Hard to tell. Good luck bro.

Ph issues and nute burn. Also looks like some Deficiency of cal mag.

This looks like ph issue or nute burn, or could even be calcium /magnesium deficiency. Check the ph of your run off, if thats ok then maybe cal/mag, increase this and if problem still persists then just give straight water for a couple feeds. Hope this helps. Happy growing, stay high, stay fly. #420everyday