Worm???

[guppy74]

I have been watching these things on different rocks in my tank for about a month, tried online to find out exactly what they are. I am pretty sure it is a worm of some sorts just what kind is the question. I finally got a pic of it.

 

[bassplaya12]

these are going on in my tank too. curious to know about them as well

 

[Sugar Magnolia]

Probably a cirratulid worm, aka hair worm. Harmless detrivores. Bookmark for future reference - http://www.chucksaddiction.com/hitchworms.html