Capture crabs and tridacies with ease! X-Terminator Crab Tridacolia Features: Trap can easily catch crab and tridaco that is prone to fish and corals. Can be used in all aquariums regardless of the size of the aquarium, fresh or saltwater. Quantity: 1. How to Use: Lightly lift the door lock at the top of the entrance of the main unit and open the door. ● Hang the door to the inner trapping rod and keep it open. Take out the white screw from the inside of the body, insert it into the screw hole on the top of the main unit, and turn it until the tip of the screw touches the internal rigging board. Please put bait such as the crill into the very back of the trap. Adjust the sensitivity of the rigging. Turn the white screw to the right for more sensitive, turn the left to reduce sensitivity. ● Lightly sandwich the bait with the rigging plate and screw to catch it more effectively.) ● If the door is closed during adjustment, the screw is slightly back and re-open it for the first time. Gently place it in the aquarium, and set it as flat as possible. Also make sure the bait inside is deep than the rigging plate (if you want to catch nocturnal creatures such as crabs, please try it at night). ● After a few hours or the next day, remove it from the aquarium, and hold the door open with a pen, and shake out the creatures inside with the top of the main unit facing down. Please be aware that if the creatures are trapped by crabs or other creatures, it may damage the trap. The trapped creatures are completely submerged in fresh water and remove them before they stop moving.