I could not find any tiny clams but I contacted my normal shrimp supplier and asked about any small bi-valves they might have. They sent me a nice cluster of live mussles and some hermits with my order (I had given permission to add to my charge card for these, no freebees). So far the mussles are doing well in with my fiddler crabs (I chose this tank thinking the crabs would eat any dead ones). Octane has eaten some that I opened for her, investigated but not eaten a cluster of closed ones (the stars opened and ate those) but ignored the third batch I opened and put in the tank (the stars had a ball with them though).
If mussles are of interest, they are not on the website but you can call or email Phyllis (office manager) or Mike (owner) to see if they have any in stock and what the cost of purchase and shipping will set you back ;>)
I found an interesting article on bivalve predation by the Giant Pacific Octopus. Of course, I only have access to the abstract...
The packaging problem: Bivalve prey selection and prey entry techniques of the octopus Enteroctopus dofleini.
Anderson, Roland C.; Mather, Jennifer A. , 2007. Journal of Comparative Psychology. Vol 121(3) 300-305.
Many predators face a complex step of prey preparation before consumption. Octopuses faced with bivalve prey use several techniques to penetrate the shells to gain access to the meat inside. When given prey of mussels Mytilus trossulus, Manila clams Venerupis philippinarum, and littleneck clams Protothaca staminea, Enteroctopus dofleini solved the problem differently. They pulled apart V. philippinarum and M. trossulus, which had the thinnest shells and the least pulling resistance. P. staminea were eaten after the shells had been chipped or had been penetrated by drilling, presumably to inject a toxin. Likely because of these differences, octopuses consumed more V. philippinarum and M. trossulus than P. staminea when the mollusks were given to them either 1 species at a time or all together. However, when the shells were separated and the penetration problem removed, the octopuses predominantly chose P. staminea and nearly ignored M. trossulus. When V. philippinarum were wired shut, octopuses switched techniques. These results emphasize that octopuses can learn on the basis of nonvisual information and monitor their body position to carry out feeding actions.
Rigby doesn't like mussels either... i just buy clams at the grocery store, they are live when the shell is still tight, they actually said they can't sell them if they aren't alive still... the ones I get are Mannilla Clams (not sure on the spelling)