I have 4 ,3 week old Northern lights in soil inside using a grow tent. Noticed one plant had been chewed on from the middle of 3 leaves while during lights out only. Used microscope but could not locate the culprit on top or under any of the leaves. Looked under your plant problem section and found nothing resembling the damage. Next time lights out brought damage to the ends of leaves on all plants. HELP don't know what to use.