Nassarius Vibex, is a small snail that is found off the west coast of Florida in shallow sand beds. They are known to help cleaning up detritus, fish waste, decaying organics etc. which will help maintaining your nitrate levels. Most of the time they will be hidden (Sand bed) but come out as soon as you put some fish food into your tank which they will devour if there are any left overs. While they are hiding in your sand bed, they will also aerate it by stirring it up. They do not eat any algae but they are great addition to any tank with sloppy eaters and problems with nitrates. The nassarius snail is a rather small snail that is often described having a olive shaped shell.