what type of oyster is this
 

found this in the sand in my tank. it is tiny like 1/4 -1/2 inch
http://i245.photobucket.com/albums/g...psmlvlhnq0.jpg
http://i245.photobucket.com/albums/g...pscw83wdbc.jpg
http://i245.photobucket.com/albums/g...pszwnl4pks.jpg

not the best pic

That might be a scallop.

been looking at pics and it may be a small one of those fancy clams

its not a tridacna im 100% on that unless they look insanly difrent includiong shell structure when young

Ok well I have no clue so.....
I'm just looking at pictures on Google and that's all I have seen with similar shell other then an oyster