she get some burned tips and brown purple top leaves
Edit: it looks it was an failing PH measuring device followed by a jumping ph. it should be better now. and be back at 6.0 the brown spots near by the light in combination with dark green leaves under beneath are the effect of to much nutrients. and followed by a copper defiancy
on 8L water
8ml coco
15ml enzyme
0,5ml PK 13/14
8 ml boost
1 drop super vit
PH 6.0 EC 800-1000
160 watt on lamp
45 cm distance
every 4 days watering.