my seedlings have now sprouted after about a week, last night they looked great, i lowered the light a littel, and today when i came to check on them 7-10 of them fell over, look shriveled up, brown, and skinny. It was about about 4 days ago when i last watered because i thot it was good enough when i checked daily. Came to check, the cubes were kinda dry. There are roots showing. WHAT DID I DO WRONG?