Character Sea Creatures Aquarium Ornaments These creatures have the quite the character. Made of resin they will sit sturdy in your tank bottom. Choose either large or small from three "toothy" animals, shark, alligator, or dragon. Note: Alternate use idea; great for desktop or counter decoration to display business cards. Penn Plax Penn-Plax is a family-owned company in operation since 1959. They specialize in creating excellent pet supplies for animals both great and small. Best known for producing pet products at affordable prices, the Penn-Plax brand is synonymous with innovation and quality, keeping your pet foremost in mind.