Harmfull or harmless bug?

[Hai]

I got bought a few bags of mulch from lowes for my enclosure and I started noticing these very tiny white bugs. They're about the size of a speck. They seem to come out when the lights turn off.
They are real hard to get a good pic of. I tried to upload a video but keep getting an error.
So any advice on what these are and if there harmless or if I should clean out everything.
The first time I had flying bugs now i have crawlers... ugh

 

[Tom]

Springtails. Harmless detrivores. They clean up the rotting vegetation in your enclosure. They come from the surrounding environment and colonize the warm damp substrate that we provide for them. I just ignore them.