Good worms or bad?

[MikeP]

I have several of these worms living in the sand of a tank I set up to hold rock and sand while setting up my new tank. My new tank is almost ready and just to be sure before I go and put everything in I wanted to know if these worms are safe?

Thanks



They live in some 'live sand' I got from someone. I planned on using it to seed the sand of the new tank.