I have these worm-like things on most of my rocks and some on the glass. Does anybody know what they are or how i should get rid of them. They are about 1 inch long have brown and green bodies and attach to rocks then burrow their "head" in the sand. Is it possible they are plants starting to root?
http://img254.imageshack.us/i/p7230619.jpg/
http://img30.imageshack.us/i/p7230617.jpg/
http://img254.imageshack.us/i/p7230619.jpg/
http://img30.imageshack.us/i/p7230617.jpg/
