Centipede? Millipede? Alien monster?

[JKeys]

I was performing the daily check up on my phrags today after I got home, and I noticed something moving on the surface of the media. At first I thought is was three of those pesky little fungus gnats walking in a row. Hmm... that doesn't seem right. (It was a long day). A closer inspection revealed what the true critter was. It almost looked like a very tiny centipede.

My question is, are these a threat to my orchids? I did some research and read that they like to inhabit decaying media. When I got these plants, the media did look a bit old. I have only had time to repot one so far, and this one is next - ASAP!! Will that clear up the problem or should I take further action?

TY