My seedlings are doing well I think. My question is some are a month old now and some are getting plump some are still straight legged. How long do I leave them in the trays and I've cut back watering to only watering when dry. Also some of my trays aren't full of mix should I add more to fill to the top?

Since they are all in individual cells, I see no problem growing them as is until spring. Even though there is less potting soil in some of the cells, again, I would leave them be.

Good job on your seedlings. I would definitely leave them alone until thay are root bound or a inch tall

Jennifer, as Ken has stated. Leaving them in those cells longer will be best. Usually a good rule of thumb is, transplant up once seedlings have at least 4-6 true leaves. If you had them all in a communal pot, then transplanting might be sooner. This is not the case of your seedlings.
Definitely do not add more soil and cover the stems.
With these seedlings, I would not let them dry right back. Seedlings should be kept evenly moist, but not wet. Making sure that they are in a warm situation and good light.

They are looking really nice, Jennifer.

Rick

Ok thanks everyone for the advice. I do have them under light when the sun isn't shining. I've been watering underneath when I see them drying they seem to be sucking the water right up

You are growing these under lights inside?

You a whole bunch of seedlings there. Are all 286 Adeniums?

Yes I am. There is 118 babied

They look so cute Jennifer!

Thank you @tarev

I have a couple seedlings that I have what looks like veragated leaves is this what they look like?

Jennifer,
I am not sure from photo. It is not all that clear to me. Looking somewhat more yellow than white/cream color on leaves? There is one with a more chartreuse color variegation. Hard to tell. Maybe just my eyes?
Rick

Can you see this picture better but your right it's green and yellow it's actually pretty I didn't know if that meant anything since it's not like the rest.