Mystery bivalves

[Feeshrfriendsnotfood]

So tiny awesome bivalves have been cropping up in various parts of my tank and I was curious if anyone knew ID’s

 

[saltyhog]

Are they all the same? Do they all have the septa like you can see in the last picture? I've had lots of these on live rock of Gulf/Caribbean origin. Some have some reall cool colors. I'll see if I can find my pictures when I get home later.

 

[cloak]

Not sure what they are exactly, but a lot of the zoanthid rocks you can buy at the LFS have these on them. I had a couple in my tank for awhile, but they only lasted about 6 months or so. They would just roam around the tank until they find a good spot. Hunker down and filter the water. Pretty cool little hitchhikers.

 

[Feeshrfriendsnotfood]

Cool. My rock was seeded in Fiji I swear every time I really look at my rock there’s a new critter. It’s honestly my favorite thing about the hobby