Unknown formation

[Lloydxmas]

I found this while cleaning my sump and then also noticed one forming on a rock in my display. Any ideas?

 

[kyliewiley]

Is say it's definitely some sort of a worm, I'm no expert though so I couldn't really say any more! Maybe try these links for more info?

http://www.aquariumlife.com.au/showthread.php/49804-Live-Rock-Critter-ID

http://www.lionfishlair.com/hitchhiker/hitchhiker.shtml

http://www.chucksaddiction.com/hitchworms.html

Sorry I can't help you more, good luck with the ID though

 

[Lloydxmas]

Thank you for the links. Any information helps!

 

[54seaweed]

looks like a type of tunicate
check this link theres a pict about 1/2 way down on the right side that looks like it
Tunicate - Wikipedia, the free encyclopedia

 

[Lloydxmas]

I was thinking it was a vermitied snail.

 

[54seaweed]

tunicate

 

[Mebbid]

I'm gonna lean more towards vermetid snail. If it's solid and calcified, then it's a vermetid. If it's soft and malleable then it's a tunicate.

 

[Lloydxmas]

It's as hard as a rock. Do they start out as little white hard spirals on surfaces?

 

[mr_X]

Yes, you got it. Vermetid snail.