Hi there, I am certainly no pro at this but it sounds like they are too wet. Could it be that the the very top of the soil dries out by their feet are staying too wet? Just a thought... Hope you get some better answers!

I agree, possibly too much watering.

Have you fed them anything? Jiffy mix has zero nutrients. Give a boost with seedling fertilizer. Not seeing top-growth doesn't mean there's no growth. Right now your seedlings are developing root systems and those are far more important to a seedlings outcome than too much topgrowth wth nothing to support it below the soil.

Outdoors you're still experiencing cool nights and the sunlight hours aren't long. You shouldn't be seeing a lot of topgrowth, that would be unatural. Patience is a virtue, don't rush the development of your seedlings.

Thank you all for your help. I have noticed about a four millimeter growth on one plant, so I have hope. All I need is one!

My eggplant seedings are turning yellow. Please see the attached photo.
Is something I did wrong? I turn the light on about 18 hrs a day.
Thanks in advance,
Jimmy

Did you harden off your seedlings before you moved them outside?

Not sure about your exact location but in general I'd think early March to be too early for maters to be outside. Granted Denver is a much different place then Washington, but were getting snow and night temps in the 20's still. If your night temps are consistently still several degrees below 50, those little dears are probably freezing to death.

These are still in door and under grow light. I just temporarily removed for photo shot that was all. I am just wondering, do I need a heat mat for this?
Perhaps, the ambient temperature is still too cold for it ??