The Mag-Float Sm & Med Feeding Clip can be added to the Mag-Float-30 Small Glass Aquarium Cleaner, Mag-Float-35 Small Acrylic Aquarium Cleaner, Mag-Float-125 Medium Glass Aquarium Cleaner and the Mag-Float-130A Medium Acrylic Aquarium Cleaner. To use the feeding clip you just place a piece of seaweed, spinach or other vegetable in between the Clip and the Mag-Float. Then watch the fish indulge!