Holes in my new clone's leaves

Hey, This could've been a small necrotic spot when it was tiny, i've seen this before and I never know what to think either except maybe like I said, some minor damage you didn't see until it was grown out. Another possibility is that you're over feeding with Nutes (for the burns at the tips). Curling is usually a sign of mild over-watering so maybe dial that back a little - let them dry out slightly and see if they return to appear more 'normal' and healthy. Also - be pretty careful not to allow water droplets to stay on the leaves while the light is on, this will cause burns too. Good Luck!