Strange looking tube worms on the side of my clam?

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I have these strange tubs worms maybe? But they have no feather duster crowns any way there in my tank every where on the rocks and on my snails any thing really. But my new clam has them every where on its shell ill post pic later. I dont know what these are but if there bad ill remove them from my clams shell also when ever the water is dirty from messing with the filter or sand bed they slime very bad they make long lines of slim in my tank that i have to remove or wait for hours for them to go away. Any idea with out a pic?

 

[mbbuna]

there vermetid snails. they are ugly when they let out mucus but are harmless

 

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Thanks. So even though my clam has 20 or more its fine?

 

[foob]

It's fine. Your rocks should have quite a few too soon.

 

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My rock has hundreads i was just hoping it was not bad for the clam I had them for 3 years but i never cared what they were before. Thanks.

 

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Are ilyanassa obsoleta snails safe to keep with clams? I took all of mine out but i just wanted to know?