It looks like ick. You need to treat it immediately with something like coppersafe or aquarisol. This can kill your fry very quickly.
When treating, it helps to increase the temperature of the tank a few degrees as it will speed up the parasite's life cycle.
they look happy just some of that spots. I will go ahead and treat with coppersafe just like Vicky said. They are at risk anyhow. I think coppersafe is safe. The problem is I have to wait til tomorrow afternoon before I can treat this.
I hope you're a4ble to battle this with minimum harm to the fry.
Dont stop medicating because you see the ick fall of your fish... continue treatment to make sure it's all gone. Also, I would do a big water change now since you can't get the medication until tomorrow afternoon.