AsNoriuanswered grow question 2 years ago starts top to bottom - root issue
they need calcium and potash now, aka hungry, increase pk part of feed
add calmag, around 0.5ml/l
You should be golden, damage leaves wont return, try to have bigger pot for future.
Make sure you watering them right and its not an overwatering and ph issue
some mycorrhizae would benefit roots a lot and ease nutrition uptake.
Happy Growing !!!