Was ist mit den Blättern los? (D3-W4)

You have a nutrient burn Reading the diary, you DON'T need to use Biobloom and TopMax when you're in the growth stage They only apply when flowering starts seriously Another mistake I think you have is overwatering. It's NOT necessary to water 500 ml every day. The substrate should dry out between waterings so that the roots can breathe. With so much continuous watering, you're "drowning" the roots in water and they shouldn't be getting oxygen You should only water when the substrate is "dry" (that is, when you stick your finger in the substrate and it has the same moisture as when you took it out of the bag) and when the pot doesn't feel "heavy" (you can check this by lifting the pot to see if it's light or not) Good luck and ask whatever you want!

It's on lower growth. New growth is healthy so don't worry. Just make sure you pH is on point.