Nah, don't worry with the leaf-scanning.

Um... can you put more lights into it?
Fluorescents... if possible.

Halogen is really not the best... but, oh well... they're 3 feet tall already.
....

Well, search for "pests"... there are many remedies... and description of the bugs... so you'll be able to pin-point what you have in there... then, ATTACK!