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could be a gastropod (sessile snail), they send out a little cobweb looking thing, loks like a cobweb, its actually mucus
 

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gastropod (sessile snail) its a mucus trap that he is stickicing out there and slowly reeling back in with stuff he catches
 

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I have what looks like a Serpulid feather duster, except it doesn't have a crown of feathers. Instead, there are two short antennae. protruding from the tube's opening and it sends out strands of mucus several inches long. What is this?
This is probably a Vermetid gastropod. It is a harmless, sessile snail that captures detritus and plankton with a mucus trap. They form calcareous tubes that project them out into the water column. An excellent article by Dr.Ron Shimek is at http://www.aquarium.net/0897/0897_8.shtml
 

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one of my vermitid was only 1/8" across in diameter, the tell tale sign is the "cobweb" it extends in the current
 
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