Hi
@WooderIce! Are these symptoms appearing only on the upper (young) leaves? If the answer is yes, you might have a light burn, in this case you should increase your lamp-to-plant distance. If you're confident it's not your light, then it's probably a potassium (K) deficiency. This could have been caused by your recent flush (plus you flushed with the wrong pH). Give it some K in her next feedings and try to stick to the optimal pH range for soil, which is around ~6.2. Buds are far from being ready and they will need some more Potassium to fully expand. Hope this will help, keep us updated and happy growing 👊