Amicc Aquarium Automatic Timer Tank Pond Auto Feeder Fish Food Feeder (AF2009D) Simple operation and installation, safe and convenient, mini shape, space-saving for your aquarium Two mode adjust:ever feeding 12 hours or every feeding 24 hours This item can be only used for the dry food. Please put this item above the tank higher to avoid the food getting damp. Then fix the tank lid well and only leave a hole. Put some aquatic weed to the hole and let the food drops to this hole, the fish will come to eat the food The item can help you feeding your beloved fish in aquarium when you are working, shopping, or travelling outside. The feeding food and time are adjustable. By adjusting the slider, you may increase or decrease the amount of food dispensed per rotation