Yeah I thought that it might be that as well when it first appeared. So I started watering my Baby plants when the light was about to turn off. Also I later found little cattapiller style bugs on my leafs (Orange very very small) IO thought it might be them eating at the leafs but I neem oiled em and killed me all and it still continued a little. Much like the small brown spots that I notice on your newe growth on the Green leafs.. Mine started as small spots then turned into bigger problkems. I still have some small brown spots on some leaves and Im in flowering right now. but Those are the original fan leaves...

I would guess Stinky is right or close shes always on point.

kd