cowrie

[redox]

I have a family of cowries that have showed up in my refugium vat

 

[Doc Hammer]

http://www.conchology.be/en/availableshells/searchspeciesgallery.php?family=CYPRAEIDAE
Couldn't really make out the markings of the shell because of the reflection off of it, but try and see if you can find it in that database.

 

[johnski]

looks like it might be a ring cowrie, monetaria annulus

 

[redox]

they have a yellow line that runs front to back . I think it might be a monteria obvelata. thanks for the link