Answer: Yes, it can be a problem if the humidity is too high even before the seedlings emerge. Damping off fungus can attack seeds just as they start germinating and kill them before you even see anything! I'd take the domes off to let them dry out and get some air circulation, especially during the day when the sun may be on them. Keep checking the soil for being too moist and that will help you know when to have the domes on or off.
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