A friend of mine gave me nearly 30 freshwater clams, mostly about 0.5" in diameter, some up to 1" or so. I've added them to my 60 gal, but I won't be able to keep them all. They are settling in, as they were in a very well maintained Koi pond, they breed in his pond quite frequently. At any rate, I'm taking 10 or so to my LFS tomorrow to see if he wants to sell them, I'd be glad to share if anyone would like a few. I'd be willing to part with 10 or so of them. They will bury themselves in sand or soil, and they are great natural mechanical filters.
Here's a pic of the tank,
https://www.dropbox.com/s/2tzby7ejbrqos8v/IMG_20130717_203434.jpg
and of them up close.
https://www.dropbox.com/s/rriy9koep97kr8d/IMG_20130717_203511.jpg
In the second pic, the moss is the the Java Moss strand I started off with, the small clam is about 0.5" and the large about 1" for reference
Here's a pic of the tank,
https://www.dropbox.com/s/2tzby7ejbrqos8v/IMG_20130717_203434.jpg
and of them up close.
https://www.dropbox.com/s/rriy9koep97kr8d/IMG_20130717_203511.jpg
In the second pic, the moss is the the Java Moss strand I started off with, the small clam is about 0.5" and the large about 1" for reference