What is growing on my snail?

[burch2006]

Hi All, my tank is pretty newly cycled less than 120 days old. Can you tell me what is growing on my snail? Theyre on some of my coral frags too.

 

[ISpeakForTheSeas]

The little, white spirals look like Spirorbid worms to me. Some people report the population of Spirorbids in their tanks getting large enough to look unpleasant to them, but the worms are harmless filter feeders.