Penn Plax Pro-Balance 7 Day Time Release Feeder Block Qty 1 Part # PBV7
 
Pro-balance dissolving fish shaped fish food
Contains tubifex, bloodworms, vitamins & minerals
Releases nutritious freeze-dried foods, while neutralizing your aquarium water
One block feeds up to 7 days for 10 to 15 Gallon Aquariums based on pH & Temp