The small Pleco Feeder is 9 7/8 inches long and will work well in 5 to 30 gallon tanks. It is made from 316 Stainless Steel and food grade silicone rubber and will provide a lifetime of service. It makes feeding your plecos and other aquarium fish a varied healthy diet quick and easy. Just screw a piece of fresh shrimp, zucchini or any vegetable and place it in your tank. A healthy fish is a happy fish. Your plecos and other fish will eat this new fresh food and soon learn when you place The Pleco Feeder in the tank that they will get a tasty treat. Great for fresh or saltwater fish.