My seedlings don’t look yo happy

Hi guys I posted yesterday about one of my seedlings That had a dark spot and people are telling I’m giving it too much water so I slowed down on that but I look at them today and it has a small six inch fan towards them and I’m seeing the soil more dry what should I do ? Remove the fan ? Also I look at my roots the other day they were nice and white and today they look smaller and browner does it means it’s time for them to be move to they original pots this is my first grow any help would be great thanks
 

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