very hard to tell anything about your grow with so less informations, to me it looks like burned by the light, due waterdrops on the leaves, or the light to close.....i was looking innto your diaries, annd the Plants look very "flat", meaning growing with a short internodial distance....
thatsays to me rise you light or dimmit back
and back to the leave, wait until it is totally crispyy and brown then just take iit away