Your search has ended! The 'X-Terminator' Mantis Shrimp Trap is here. Now you can catch those unwanted shrimps and crabs without disturbing the beauty and delicate balance of your aquarium. The 'X-Terminator' incorporates a release sensitivity adjustment to help in catching all size creatures. If you have live rock in your tank then you probably have a mantis or other crabs that you should remove. Do not hesitate, the 'X-Terminator' is what you need. The 'X-Terminator' comes packaged in a 4-color hanging box with UPC code.