Yellowing lower leaves

I agree with Biobuds, Juanhaze, continuous overwatering. Foliar spraying some nitro (maybe even something like kelp, or spirulina if you happen to have, otherwise piss is pretty good hey) might be a good idea.

The hanging leaves suggest nutrient shortage by overwatering. Let the soil dry out, only spray the leaves with solution of water growfeed and high phosphorous feed (green sensation), tocompensate for the loss of nutrients via roots. Not when lamps are hot or close to growlight, you will burn your plants. So before lights go on and maybe dim lights for couple of hours until plants are dry again. Good luck!!

Brave got it bang on ! Shes a large plant she needs more feed but please let her dry out first the drooping leaves are a massive sign of overwatering. Shes a big plant yeah but let her dry out before watering again and when she has dried out feed her some of your veg feed and that should clear up. 👊

PH 6.1 is too low, therefore possible phosphorous deficiency. Try to do 6.4 to 6.6 all the time. Also, the soil looks too moist, therefore overwatering issue and possible fungus gnat damage.

Hola! No soy un experto. Pero mirando tu planta por arriba veo que las hojas verdes están decaídas. El sustrato se ve bastante húmedo. Para mí estas excediendo el riego. La planta se asfixia y no consume nutrientes. Espaciar más el riego y aplicar npk una vez que esté seco el sustrato. Espero ayudarte.