Yeah I have been looking up which species it might be and am now on a pretty good track...there is a lack of good information on millipedes lol. I will wait until I can see him again to confirm species, but from what I have seen so far brightly colored is bad...this one isn't brightly colored so that is a good start lol.
I'm thinking it is most likely the Oxidus gracilis. Here is some info:
Garden millipede
But again just a guess at this point. It says at the end of the article that it can be toxic to things like spiders or ants but are eaten by lizards and such. Still unsure if it is this same millipede and if so, if it is dangerous for my crestie. On a side note it also said that they may be parthenogenic! So it may end up reproducing even if it is the only one!
*Also I have no ownership of rights for the picture of the millipedes (above).*