Tropicana Poison XL Auto Duo 2x2

Previously damaged leaves will not recover, they will stat damaged, no matter what you do. The curved/dry/thin/burnt leaves are due to nitrogen/fertilizer toxicity, due to feeding too much, too often............or both! Your diary has basically zero information, but your plants needs for grow/nitrogen fertilizers really drop off during flowering. In soil, a routine of plain water/plain water/feed/plain water/plain water/feed is a schedule I have been using for 30 odd years and it works well for me. Plants need to use what is already there in the soil, before new nutrients are added, especially when growing in (small) containers.