Hi according to the book A pocket expert guide Marine Invertebrates by Ronald L. Shimek PhD what you picture as a spaghetti worm is actually a Cirratulid (hair worm).
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Thank you, Crabs!Yes, feather dusters
Found one more good picAnyone know what this is? Found a few around my tank. Most smaller/growing on rubble. Do they sting?
Ball nem. HarmlessFound one more good pic
It is stickied to the top of Hitchhiker And Critter ID Forum...For the love of god... make this a sticky!