nice job with the seedlings. how old or young are your seedlings?

Planted mid to late August

These are under lights, I guess? Will they be like that all winter?

Yes they are under 2 sets of 2 bulb flourescent strips... have a problem keeping them moist enough... the top layer is pumice and below is a fast draining mix about 1/3 potting mix, 1/3 pumice and 1/3 perlite. I plan to keep them warm and mildly moist all winter... not sure about the euphorbia though... I always thought they don't like to be moist for very long after germination... maybe frank would be willing to interject