2 mouths on a rock?

[TheRealFF]

I got a soft coral frag yesterday and when i put it in the tank i noticed a maxx of blackish tissue on the rock which the coral is attached on. It has 2 opening's that opens and closes! They look like they have tiny teeths. What are these? Will they cause problems? My camera broke so i can't take a picture of it

Thanks in the advance

 

[dskidmore]

Can't say exactly, but probably just a filter feeder of some kind. Nothing other than the mouth moves? Hope you get your camera fixed soon!

 

[An t-iasg]

I remember this type of question coming up before. It doesn't appear harmful. Here are some other threads about this topic:

http://www.aquariumadvice.com/viewtopic.php?t=35160&highlight=

http://www.aquariumadvice.com/viewtopic.php?t=55625&highlight=teeth

 

[TheRealFF]

Finally got a picture

Here it is, rock with 2 mouths! Rarrggh!

 

[Hara]

appears to be a type of tunicate

 

[got bait?]

sponge?