3-day Pyramid Feeder Automatically feeds fish for a whole weekend. One pyramid feeds 15 to 20 average size fish in a 10 gallon tank. For fresh or saltwater fish. 1 pack of 4 pyramids.7-day Pyramid Feeder Feeds 20 average size fish in a 10 gallon tank for 7 days. On or about the fourth day a secret chamber releases tubifex worms. For fresh or saltwater fish. 1 pack.Vitamin/Mineral Pyramids Vitamin and minerals for freshwater fish. Contains stabilized Vitamin C to improve fish color. Lasts 7 to 10 days in a 10 gallon tank. 1 pack - no food. For fresh or saltwater fish. 1 pack.

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