ID on live rock?

I have a quite a bit of wormlike creatures on my live rock that look to produce somewhat of a cobweb to the rock. ( Maybe to catch food? ) Im sure they just might be harmless filter feeders so I have some pics if you guys could tell me what this is. Like i sad their are a number of them in my tank and i want to know if they can become a nuisance if they spread. Also on my live rock what is that coloration on it?

 

didnt see the "worms" you were talking about. but as for the coloration dont worry about it. its just corelnia

 

i know what you are talking about they look like piles of dog poop and send out strings in the tank. they are harmless just wish i know the name sorry

 

I believe they are Spaghetti worms terebellid polychaete.. mine do the same when I stir up the substrate..

they are great members of a CUC and sift through your substrate..

 

yah there curled at the bottom haha like this picture at the bottom! yeah i figured they were harmless. The form somewhat of a cob web but your right usually around feeding you can see the string waving in flow of the water. Thanks!

 

I hear they can sometimes clog intakes so check your lines once in a while.

 

Vermetid snails are actually quite interesting IMO.

Monterey Bay Aquarium: Snail (Vermetid Gastropod) Feeding Video

 

That look like it inwall.. just 100 times bigger then the ones in my tank. thanks for the id

 

I agree.. I have vermetid snail as well.. got them mixed up!

 

vermetid snail they can irritate ur coral if ther web is hitting it so ive heard