What is this thing?

[cillam]

I bought this coral from my lfs about 4 months ago and always noticed that it looked like something was under/inside of it.
Recently it has moved out slightly. What ever it is seems "fleshy" so not part of the coral and when ever I do a water change it goes back into the hole for about a day. I have not observed it come out of the coral.

I always dip my coral in bayers insecticides, so unsure how the thing survived.

Also what kind of coral is this

 

[WalkerLovesTheOcean]

Can you try to get a picture under white light?

 

[Dom]

Maybe mark up the picture to show what you're looking at?

 

[cillam]

Some more photos under white light

 

[Dom]

Good photos and an even better question!

Does it seem fixed or does it move?

 

[Rjukan]

Coral looks like a type of favia to me, can't tell if it's a mutli color or if that's skeleton showing.
The mystery thing under it... you'll have to get clearer pics.

 

[cillam]

Good photos and an even better question!

Does it seem fixed or does it move?

I have not seen it leave the coral, it just stays under their but the part which is viewable in the image moved and retracts back into the hole, it looks fleshy whatever it is.

 

[Reefkeepers Archive]

I have not seen it leave the coral, it just stays under their but the part which is viewable in the image moved and retracts back into the hole, it looks fleshy whatever it is.

Could possibly be a peanut worm? @ISpeakForTheSeas?

 

[ISpeakForTheSeas]

Could possibly be a peanut worm? @ISpeakForTheSeas?

I have not seen it leave the coral, it just stays under their but the part which is viewable in the image moved and retracts back into the hole, it looks fleshy whatever it is.

Looks like either a solitary tunicate or a bivalve siphon, but I can't tell which from the pics - either option would be harmless.

 

[JonoH]

Looks like a vermetid snail maybe

 

[Dom]

I have not seen it leave the coral, it just stays under their but the part which is viewable in the image moved and retracts back into the hole, it looks fleshy whatever it is.

You may want to quarantine that piece until you determine if its friend of foe.

 

[KrisReef]

We need a clearer picture of this Sasquatch to confirm, or maybe it's the Kraken? @Katrina71 This might be it!

 

[Katrina71]

Looks like ISpeakForTheSeas already called it. I vote tunicate too.

 

[Katrina71]

We need a clearer picture of this Sasquatch to confirm, or maybe it's the Kraken? @Katrina71 This might be it!

One day... somebody will have one.

 

[KrisReef]

One day... somebody will have one.

Yes, not in our homes but in a zoo, next the Nessy I suppose.

 

[cillam]

So today the thing moved to a spot where I can a better look, it's something inside of a "clam" shell, it was open then quickly closed when I showed light on it.

 

[cillam]

*duplicate reply*

 

[ISpeakForTheSeas]

So today the thing moved to a spot where I can a better look, it's something inside of a "clam" shell, it was open then quickly closed when I showed light on it.

If the "clam" shell opened and closed with the fleshy tube inside, then the fleshy thing is a bivalve (clams, mussels, oysters, etc.) siphon, and the "clam" is the bivalve.

 

[MAH]

The coloring in your last picture reminds me of a turkey wing clam.