Please Help

[fla. keys]

Hello,
Question for you pro's.
I have noticed the last couple of days that on the glass of my tank I am seeing a bunch of these thin white looking worm creatures. They are about 1/2 inch long and look like the thickness of only a strand of hair.
What are these?
Are they bad?
should I even be concerned?
Thank you.

 

[k.lee]

Do they move, or are they calcaerous? Only there when you turn your lights on?
I wouldn't worry, 'less they are flatworms. And even then . . ..

 

[fla. keys]

They do move. they have the smallest legs, look like tiny millipeeds. Just curious if I should be worried or not or what they are?

 

[k.lee]

Sounds like fireworms if they have legs. What color are they bluish-white with red? If so, they are fireworms.

 

[fla. keys]

The worm looking things are solid white. Half an inch long, like 30-40 hair like legs and crawl ever so slowly up and across the front glass.??????