Anyone know if this is a deficiency or burn?

Was there a splash of nutewater perhaps?

Opinion only but it looks like water on leaves while lights on.

@Diza I’d need a picture of the whole plant not just the leaves to help. Take some of the leaves, the stems, and the whole plant from a distance.

Hopefully this pic helps. Let me know if not

I use dry amendments but use CalMag in my ph’d water

@Diza looks like you had a magnesium deficiency earlier on that recovered. Looks like it was caused by a potassium issue as well but that also seems to be resolved. All of the new growth looks healthy though and as you get later into flower you will start to see a lot of the lower fan leaves start to yellow as well which is pretty normal.

Thanks so much! Super helpful!!!