Burnt tips? Or Nutrients

It's interesting that you experienced an excess of nutrients in your plants without adding any additional supplements. This could have been caused by a new substrate you purchased. That's why it's recommended to choose reputable brands to ensure you get quality products and avoid unexpected surprises. It's important to consider that some plants are more sensitive than others to overfertilization. Each plant has its own nutrient needs and tolerance. Therefore, it's essential to carefully monitor nutrient levels and adjust them accordingly to avoid overfeeding. If you encounter an excess of nutrients, you can perform a root flush. This involves rinsing the plant roots with water to remove the excess nutrients from the substrate. If you observe healthy growth in new leaves and shoots after this, it's a sign that the plants are recovering well. Greetings, and I hope I have been helpful.