Penn Plax PBV1 7-Day Vacation Fish Feeder 7 Day, Vacation Feeder That Is The Ideal Product When You Need To Feed Your Fish While Traveling Each Time-release Block Can Feed Your 10 To 15 Gallon Aquarium For Up To 7 Days Made With Pro Balance High-quality Fish Food Contains Fish Favorites Like Tubifex, And Bloodworm Along With Essential Vitamins, And Minerals Place One Block In Your Aquarium, And The Block Will Slowly Dissolve Releasing The Nutritious Freeze-dried Foods