had some issues with a possible fungus, dried it out, hasnt had any visible effect on any of the other leaves, remoned the bad leaves, seems to be growing ok again.
Hi fella, it could be fungus due to high temperature in the roots and high levels of humidity.
Let it get dry the soil a few more until the next watering.
The contrast of the super deep purple with the white pistols is amazing. Looking good, I'm super curious to see how your LST experiment turns out between the two plants.