Any ideas, can't get this straight...

leaves curl up at the end like that from usually too high temps.
less frequently - RH.

they look like they could use a boost of N, and I would either double check your ph, or if you are using hard water, should invest in some cal-mag. I had issues with the leaves like that until I started adding it. Other than that, looks like it's doing well. Lots of branching, tight node spacing, mostly green leaves, a little tweaking and I think you'll be really happy with the results.

Post what you are growing them in, what you're feeding them and the soil Ph. There could be Magnesium deficiency and maybe some Phosphorus def.

Sure looked tight in those half filled 1 gallon pots. Upgraded their root space, thanks.