What is causing this? And can they be saved? It doesn’t look bad but when the light is on it look bad.
A support ticket will help
Strain; Type, Bag seed, or NA
Soil in pots, Hydroponic, or Coco?
System type?
PH of runoff or solution in reservoir?
What is strength of nutrient mix? EC, or TDS
Indoor or Outdoor
Light system, size?
Temps; Day, Night
Humidity; Day, Night
Ventilation system; Yes, No, Size
AC, Humidifier, De-humidifier,
Co2; Yes, No
Ph is out of whack … 
You might be slightly over feeding also…
I’m going to guess nitrogen burn. It is usually that when the tips are burning like yours.
Do you know your PPM?