Weird growth on rock

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Were they initially on the underside of the rock?
 

jacquesb

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OK - probably the following:
"SPIRORBID WORMS
hhgood.jpg
Little hard white spirals on your rock and glass causing confusion? When you look real close, do they have little feathers sticking out the end? Congrats, you got yourself some spirorbid worms. These little guys live in their calcareous shells and filter feed. They are harmless additions to your reef."


From: Xtalreef
 

Mike

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Warr, do they withdraw if you touch them? they don't look like they have a shell, just rather stick out from the rocks, i had these on some rocks, they never did anything, i'd love a positive ID for them.
 
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Warr, do they withdraw if you touch them? they don't look like they have a shell, just rather stick out from the rocks, i had these on some rocks, they never did anything, i'd love a positive ID for them.
No withdrawal from touch.
 

Mike

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I would guess at some form of algae then, nearly all worms/nems etc withdraw from being poked.
 

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