Funny how the solution to grow issues is often simple and environment related.
I have been having stress i keep thinking is from the circulation fans. I have a lot of air flow going on in there but always was for mature plants. I have tried pointing them up more.
The little ones are getting more stressed as they grow up and i move them closer to the fixed lamps. The fan wind up there at the mature canopy height is significant on the young plants.
So my dumb ass just turned the clip fans to low. They have been set to high for years. Duh!
Im watching for the temp to rise but really should be no problem.
So lets see if it fixes this leaf stress.