Light green leaves

It should need the same stuff as the other plants are getting in its age group. The ph is a bit high for my liking as is the EC I would like to see them aorund 6.2-6.3PH and 0.9-1.3EC This could be some of the problems and why your seeing what you seeing. Some magnesium never hurt as well. Best Of Luck!

Salut je pense que tu ne laisse pas suffisamment sécher le rockwool entre chaque arrosage je te conseil d arroser 2..3x par jour en petite quantité Et il faut essayer de mettre quelque chose au fond que le cube ne traîne pas dans l eau d écoulement (surtout quand le pot ne permet pas à l air de passer au fond ) petit conseil l eau oxygénée aide contre la pourriture des racines 3ml/ par lettre d eau en général mais tu peut tester avec la moitié du dosage pour voit si la plante aime ou pas .perso j utilise sa toute les semaine au moins une fois pour oxygénée mes racines voilà j espère que sa peut t aider et si tu rencontré des soucis tu peut venir m écrire en privé j aide avec plaisir ^^ bonne fête de fin d année à toi et ta famille ainsi qu à tous les lecteurs et leurs familles ;)

The main problem here is that you are feeding her from above in this long thin cup full with saturated rockwool while the majority of the roots is laying in a puddle of water at the bottom of this cup. The ratio between water, oxygen and nutrients is off. In this case because of lack of oxygen. Because of the lack of oxygen she can not process the water with nutrition fast enough while she is craving for a lot now trying to make her buds grow as fat as possible. That is why she is using her spare build up nutritions from inside her older leaves and that is why they are fading in colour. All her energy wants to go to the buds at this phase of the grow. The solution is really easy. Move the watering system to the bottom 30% from the cup and she will have enough oxygen at the 70% above to start her little factory working properly and in balance again.