I think you need to let them dry out. These seedlings need very little water. The roots need oxygen as much as they need water. After the soil dries out, it will take the plants a day or two to adjust and recover. Not just dry on top, not just drained, but actually drying out. As the plants get bigger and have a lot of leaves, they will use more water. You can plunge your finger down into the soil and feel how wet it is. Your finger shouldn't feel hardly any moisture before watering again.
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