remove dome yesterday..... as for moving indo indirect sun light also do when first seed sprout. hold of transplanting till 2nd set of true leaves.
Mold is best prevented not treated.... start with sterilized soil & keep tray in a area with good air circulation....

If they're outside, they shouldn't get too leggy in the shade, just might retard blooms and possibly growth if they're full sun plants. Inside is a different matter, as lights can be, too.

Here's how I deal with mold, but if it's on the pellets, I'm not sure. I guess take off the dome and be sure not to let them dry out, don't move them into the sun until they can handle it.

I found it on one of these forums, but I keep a commercial grade spray bottle with 1 part drugstore 3% hydrogen peroxide and 10 parts water. For me, that works out to 1/4 cup hydrogen peroxide and 2-1/2 cups water. They say even plants without problems like a little now and then.

Anyway, it takes care of that white furry mold, not moss, and helps prevent damping off inside. Think you don't have to worry too much if you're starting your seeds outside.

I only came over here to watch for a response to a thread, and hope it helps some. Agree that it's best prevented, but sometimes you have to deal with what is and learn what to do differently next time.