unless I'm confused on the terminology here chronic = kush and vice versa.
kush leaves are smaller and rounder looking in appearance and easily stand out in a crowd.



you can see the leaves of other plants right around it, they are very distinct, all Kush.

switching the light cycle at any age can shock them and you might get herm's even switching to 12/12 is a shock. This can be reduced with dim-able ballasts and a gradually shortening light schedule over a week period