Natural Catch: The Trap Can Naturally Catch Planarian and Leeches in the Fish Tank, Adding to the Fun. Not Pollute the Water Quality. Reliable Material: Made of Transparent PC Material, Which Is Healthy and Environmentally Friendly and Has A Compact Interior that Does Not Interfere With the Tank's Landscape. Equipped With A Metal Block: The Metal Block Allows the Trap to Sink Naturally to the Bottom of the Fish Tank Or Aquarium. Easy To use: Just Pour the Bait Food Into the Bait Chamber and Cover With the Lid, then Sink Naturally to the Bottom of the Tank Or Hang Vertically in the Aquarium. SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please contact us.We will provide after-sales service .