We regularly come across some of the unique creature of the ocean, and keep them in our tanks for curiosity purposes. We have decided to make them available to our customers for free, as long as they understand the risk. For example, I have a few Gaudy Natica's. A beautiful snail, it will scavenge, as well as eat small bivalves and other snails. Good for a sump or tank that can accommodate this creature. I also have a Giant Atlantic Cockle, a filter feeder, it like most clams should not be consider a cleaner, rather it is a pet and you should feed it. Assorted "cleaner clams", decorator crabs, and a small 2 inch box flame crab round out the current list. Oh, no wait - I have a few marginalia snails, nicely shelled creatures, but only reef safe with caution as they may kill other snails. I also have a stiff pen shell. This is the creature that makes natural black pearls. Ugly on the outside, its inside is iridescent, and renown for its mother of pearl. and a couple of unidentified nudis, but I am growing them out.