Help ID please

[embitler]

I found this on the back of one of my large hermit crabs, its really time and hard to get a photo. If touch the shell it retracts up immediately and I can see anything, after 10 secs or so it comes back out. Just hoping its not aptasia....

 

[embitler]

Could it be a barnacle?

 

[Lovemyreef2015]

Could it be a barnacle?

I would say it's a feather duster. We have had them come on snail shells before. Good little filter feeder.

 

[embitler]

I would say it's a feather duster. We have had them come on snail shells before. Good little filter feeder.

I was able to get some better photos and would have to agree that they are feather dusters now. The tube was made from coraline and blend into the shell.