Cleaner clams are also called littleneck clams, cherrystone clams, etc, and might be available at your grocery store for the staggering price of 32 cents... Littlenecks are a more temperate water species then we typically keep our aquariums at, so longetivity is a concern. I buy littlenecks all the time as food for my fish, and store them in my 90gal reef. My opinion is that the low survival numbers are due 50/50 to the water temp issue, and the transportation/display issues. These guys are usually just kept on ice. Out of 3 dozen or so clams only a handful live more then a few months.