Miracle dawn

@DaddyPrime2, thank you thank you thank you for your replies and interest. The light is the same one she's been under since the start, a 65W (600W LED equivalent) Grocruiser LED. Same area too. Yea I opted for lime over vinegar. Today I watered after 4 days no watering, with rain water and some lime juice and a bit of a fermented nitrogen mix I made (black tea + oats + some banana left in a jar...) not sure if this is great haha. Soooo I don't know, have to wait and see. So far the leaf burning from tips is continually progressing, also on my other plants. I'm gonna try using just rain water and watering plain like you say, over next week, see how it goes. I might add some lime juice to rain water to lower pH slightly. Only nutrients I add is an organic liquid seaweed feed - it has varying recommendations for ratio depending on plant, so I add about 3-5 teaspoons per 5L about. Thanks for reading