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Seedlings drying and curling

Help!!!  :)

I have about a dozen Melampodium seedlings left out of an original 30, and
they're going fast...

First, some background.  I started the seeds in mid-February in a soiless
mix comprised of milled spaghnum and vermiculite, covered them up and
kept them on a table over by the hot water heat registers.

The seeds germinated quickly, sending up shoots within 6 days.  I uncovered
them and left them in warmth for another week until all of the seeds were
germinated.  At that point I moved them to a sunny window during the day
(about 70 degrees), then moved them to the mud room at night (dark, about
55 degrees).  I've continued this for the past two weeks.

Oddly enough, the sprouts aren't growing any more -- the true leaves
haven't even emerged yet, and it's been a month.  I'm not sure if it's
my imagination or not, but the seedlings look more yellowish too.

Then the cotyledons began curling on the edges, turning black, and
falling off.  This just left the pale white stalks sticking up into
the air, sans any kind of foliage.  I've since lost about half of my
seedlings to this mysterious ailment.

Thinking that they may need better soil, I transplanted my seedlings
into a potting soil/perlite mixture with spaghnum moss underneath, and
this appears to have checked the problem.  This was about a week ago.
Now today I noticed that it's starting again on one of the seeds.

They have good temperatures, enough water (although maybe too much), 
and good ventilation.

What can I do?  Are they lacking in nutrients?

Chris
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