Patented inner chamber supplies spirulina algae for a mid-week treat. One pyramid will feed up to 15-20 fish in a 10 gallon tank for 7 to 8 days. Provides a superior nutrition source for aquarium fish when the hobbyist is away. • One pyramid will feed 20 average-sized fish in a 10 gallon aquarium for 7 to 8 days. • Blister card of one feeder