Hey growmie! That looks like it could be a combination of nutrient lockout or phosphorus deficiency. The brown/purple spots and leaf edges are classic signs. Since you’re watering with pH-adjusted water now, I’d recommend checking the runoff EC/PPM if possible. If it’s too high, a gentle flush might help reset things. Otherwise, adding a touch more phosphorus (bloom nutrients) could help stabilize it. She’s still building buds—so you’ve got time to steer her back on track! Good luck 🌱✌️