Hi binaryT -- I can tell you that from what I've observed, my customers who are feeding their saltwater pets are most interested in the small (1/4 - 1/2 inch) shrimp, although some go for the mediums. The smalls are the most cost-effective, and octopuses have fun catching them (by all appearances, it's much more rewarding than frozen shrimp on a stick). A separate feeder tank is pretty much a requirement, of course.binaryterror said:So should I just feed him clams from octopets.com and shrimp from shrimpstuff.com?