This is a perfect addition to an ocean theme! My son Nicholas got these hermit crabs for Christmas. They are very low maintenance or Santa wouldn't have brought them! They came from the pet store. You can get hermit crabs with painted shells or non-painted shells. They are around $6 - $7 each. When they get bigger than their shell, they need a new shell. You can purchase bigger shells, they make the transition themselves. They are kind of skiddish, but they do come out. They eat hermit crab pellet food, fruit, banana chips, dog food, cat food and lots more!