worms in the sand

[stonefox]

There are a lot of these worms - see video - in the sand in my aquarium - are they harmless to shrimp?

How can I remove them?
http://www.youtube.com/watch?v=Kph4z2gm ... ature=plcp

[Mustafa]

Yes, they are harmless. And no, it's impossible to remove them unless you clean out your tank with acid and boil your substrate (which I don't recommend).