Bandog,
Have you given them any nutrients yet?
Looks like they could use a little Phos. and Nitro. Nothing to critical at this point, but you want to stop them from being deficient. It could be the strain but watch out for more yellowing of the leaves, (nitrogent def.) and a reddening of the stalks (phosphorus def.). Usually I keep on hand some Happy Frog All Purpose fert. just incase I need to ad a little stablized feed, mixed with a little (1 tblsp. per gallon) molasses.
Fertz used on autos in veg, should start at 1/4 strength, up to 1/2 strength.
Just an opinion, I don't know all, use it if you think it fits.
bye for now
Peace
Eek