Help identifying random hitchhiker.

[Kaylin1986]

So I am new to this hobby. I recently found nice zoa colony. Now I have some random hitchhikers I can't identify. They kind of look like clams. Any help would be appreciated.

 

[Crabs McJones]

Bivalve, cool hitchiker. Filter feeder. Welcome to R2R!

#WelcometoR2R

 

[Kaylin1986]

Should they be remove. Or moved from the zoa colony

 

[AdamNC]

Keep them where they are. I’ve had 2 in my tank for the past 4 years and they are now about 1 1/2” long now.
Here’s one sitting on Tropic Eden Reef Flake substrate for size comparison, which is about 3-5mm.

 

[Crabs McJones]

Should they be remove. Or moved from the zoa colony

You can leave then

 

[Ron Reefman]

Welcome to the addiction... I mean hobby. And to R2R. Don't be a stranger.

Heck, when I go snorkeling in the Florida Keys, I'll collect one every once an a while to put in my tank. Then I sell a colony of coral on a rock out of my tank and a clam goes with it! That way I get to collect more. The same thing happens with some small crabs, serpent stars and other small inverts.