not to small but it looks like they have got a little nute burn, I would let them get one more full set of leaves out (7set) before you get the top on , then you got a few internode spacing that you could snip off if you wanted to focus on the tops
I top my babies when they get a 3rd set, never had a problem. As for the nute burn, what soil are you using and are you feeding them? If so, what nutes are you adding?
i think there too small to top. maybe work on the leaf burns, then when a little more healthier do your thing.
all in all plants look great, nice work.
I know it looks like nute burn but I'm not sure. I'm using basic Miracle Grow "moisture control" that has very little nutes in it.
A couple a weeks ago I had to remove them from my house and put them in my garage where it was COLD. After a day or two fighting the low temps. I placed a Heat Lamp in the cabinet and they turned into this....
So to me they are recovering great since I pulled the heat lamp and added electric heater instead.
I'm thinking what looks like nute burn is just recovery from my fuck up....
I did add about a quarter of a stick of mircale grow plant food. Full Stick is 6-12-6.
Should I pull them out?
My Northern Lights seems to be slow grower. Only popped one so may be a case of just unlucky with that particular 1 bean! Luckily aint my only one going