Stonerdanswered grow question 4 years ago Seems like the start of Calcium (Ca) deficiency, might wanna start adding some Cal-mag fertilizer in the mix!
as for the droopiness it might be because of water, when irrigating make sure there's good drainage with at least 20-30% of the irrigation solution as runoff
Make sure to let the top 5cm of the grow medium dry before irrigating again to give the roots the oxygen they need! but remember not to dry your medium completely!!
Hope this helps! Good luck and happy growing :)