Is this a pest/infection or dried up minerals? Just noticed this (white patches with some dead tissue) on my monstera. I water with unfiltered tap water normally, but recently did a repot so I've been supplementing a plant start mix with various vitamins. Please tell me this is accidental splatter from watering and not a pest! 6 hours of grow light ~.5 m away in addition to indirect sunlight (West facing) from ~10 feet away. Originally by u/Item_Store on Reddit: https://tinyurl.com/263tjmyv