NorthFin offers premium Kelp Wafers. Unlike algae, kelp is premium grade seaweed. Kelp supplies your herbivore fish with 60 minerals, 21 amino acids and 12 vitamins. It also contains nitrogen, potassium and micronutrients your fellow grazers need to stay healthy. Available size : 14 mm Type : Slow sinking wafer Recommended for : For all types freshwater and saltwater, herbivore and omnivore fish. Available Sizes: 100 g / 250 g / 500 g / 1 kg / 2.5 kg