AWESOME tank. I like the time line photos they really show how your tank has and grown and changed over the years. Looks like you did not have much luck keeping clams, I love clams but did not have much luck either killed more than a few. I did have a nice derasa clam that I grew from a 2 inch baby to a 8 inch center piece, it looks a lot like this one
http://www.liveaquaria.com/product/prod_display.cfm?c=497+529+2974&pcatid=2974. But I sold it with my tank and now is in a 300 gallon tank happy as a well a clam.