Anyone know what this is?

[theronsta]

I have these all over my tank and tey didn't seem harmful until my sunset monti wasnt growing where these touched it. they look like the feeding tentacles of something. They are either just one protruding from the hole or two.

the real obvious one is to the right of the chalice. you can also barely see one on the rock below it

 

[rjbesch]

That's odd looking

 

[swannyson7]

Are any of them coming out of a calcerous tube or just out of holes in the rockwork?

 

[cjvale]

i have seen those in some peoples sand beds... almost like a tube creature of some kind.

 

[Lateral72]

Spionid worm. Reef safe.

 

[donfishy]

yup, just a reef safe worm, nothing to worry about

 

[theronsta]

but theyre obviously keeping my monti from growing there. And if it does portrude from the rock its likeits using the sand to make a tube.