Seedling question

Germination start time- 10/17 @ 12pm Seeds popped and started sprouting way faster than anticipated this time (first sight of sprout 2 days ago)and still under the dome unvented and total darkness in rockwool cubes..one seedling looks to be maybe a couple inches I know too much moisture for too long can cause some mold issues and t-5s are good for seedlings but I can’t get back home to them until later tomorrow... I’ve seen different opinions regarding duration of seedlings under the dome but just seeing if anyone has some more feedback on the subject?

Should be fine for a couple days, if you have domes. The moisture from the cubes will cause condensation on the domes, which will then rain down on the plant. You can also put extra water in a cup, or whatever you can fit under the dome, which will also help with moisture. Along with the roots, the leaves can absorb moisture as well (known as "folier feeding").

You can give them light, if they've sprouted. Just use weak lights, or a light with some distance from the sprouts. They don't need much at this point.

BTW, t5's are excellent for clones and starts. Raise your hood to about 12" above the starts. If you see stretching (not counting the little stretch seedlings do on their first set of leaves), you'll want to lower the hood a little. Once they've got a couple pair of side shoots, you can lower the hood to about 6" above the starts. Around a week later, you can lower it to within a few inches, if your able to keep your temps in check. It's easy to keep t5's cool. A PC works great!

As soon as they sprout you need to start adjusting them into the environment they will live in.
Leave your domes cracked after they sprout so your humidity is not at 100%, but more like 70-50%. Crack the lids or prop them up with something.
You want those rockwool cubes going through a wet/dry cycle out after they sprout so the roots are encouraged to grow and fill the cube.
Get em nice and healthy in the cubes and they will transplant real nice.
Light on in the cycle for my choice from day 1.