little spiral things

[Absint Reefer]

their are a bunch of little spiral things on the front of the glass to my salt tank that look almost like tiny co co worm shells what animal makes these?
thanks,
Carson

 

[kevin2000]

Spirobid worms? ... tinny calcareous filter feeders that won't harm anything. Should be some pics on the internet.

 

[Andrew]

Try here Carson....

http://melevsreef.com/id/crawls.html

2nd picture in the 2nd row.