What are these worm like things and what can I do about them?

[tt101]

Hello Everyone,

I have a basic 20 gallon FOWLR tank that currently houses 2 ocellaris clowns and one pajama cardinal. This has been their home for 4.5 years now. Out of nowhere about 1.5 years ago I started seeing these tube like wormy white things poking out of the sand. Thereafter their population has exploded and they cover all the sand in the bottom as well as up the lower 1/3 of the live rock touching the sand. They are about 0.5"-2" long.

I am going to be upgrading the tank soon hopefully to a 40-50 ish gallon tank but I want to eradicate the problem before moving the fish/rock over. What can I do? I'll attach some pics, I appologize for the crappy quality.