the tips of the leaves burn a little, what could be the reason? it doesn't look like a light burn
PH 6,3
Plagron coco a+b
950 ppm
25*C / 50%
Quantum board 120w Samsung / dimming 50%
It's an indication of a slight nute burn... At this stage, it's nothing to really worry about unless you start seeing signs of a deficiency... She looks good to me!
Good luck!
It is quite normal for the tips to do this in soiless grows as they change into flower. IMO it is just from the many changes the plant has to deal with as they transition