Is this okay?

Im extremely new to this so I'm trying to get as much help as I can while learning.

I built this probably 3 days ago and wiped all the glass down yesterday morning now it looks like this today and looks like it has mold growing? This is going to be for just the springtails it has in it. If that's mold do I need to clean that or just leave it and the springtails will take care of it? Any help would be greatly appreciated thank you