They look like 5 - 6 week old weed plants should. The first pic is extremely blue and it's hard to see anything there. The second pic looks a bit brighter and they look OK in that pic.
Did you flip on the BLOOM switch for that second picture? If so - good. You can leave it on. During VEG, they need both the blue and red light. A little bit of red during VEG helps them to elongate their branches just a little. And since blurples don't provide lots of red, they are the prefect BLUE/RED mix for the VEG phase.
They should show pre-flowers soon. Alternatively, you could force them into 12/12 for a few days to see which ones throw female white hairs. Then you can ditch those that show the "twig n berries". Once you have removed all the young dudes, you can go back to your VEG light cycle them VEG them as large as you want.
