I have a tip burn, and I believe that may be a lig...

@crimsonecho. 1. My temps are around 28C. And I do not have a chiller. 2. The water is very hard, with 411 ppm out of the tap. I have a hard water Nutrient Trio from Terra Aquatics. Tried Grow - 0.5ml/L, Micro - 0.2ml/L, Bloom - 0.2ml/L, Hydrogen Peroxide 6% - 1ml/L. That raised the ppm to ~600. Kept a couple of days. When I saw this tip burn, I changed the water and just added Hydrogen Peroxide and Micro. The ppm was around 500. 3. My PH is very unstable. Around 8.0 out of the tap. I added 19ml of PH down (phosphoric and citric acid mix) to bring down to 6.0. It got raised to 7 overnight. Added 10ml of PH down again.

i can help you differentiate between the two with one simple question fyi.. are your temps too high, exceeding 29-30C? what are you feeding this gal by the way thats helpful to know. usually when its light stress the leaves will not point upwards in a praying pose. so anyway what are feeding it with?

Looks like light burn, look at the leaf tip, when is burned with nutrients has a different color and is only the pointy tip, looking at your picture, it has the tip and a little bit, this will increase. by the time, also tips look dried but yellowish, not brown color