NorthFin Tropical Sticks Premium Fish Food. NorthFin’s Tropical Sticks are perfect for feeding your large South and Central American tropical fish. Each floating stick is packed with 100% premium ingredients, offering them a perfectly balanced diet with no fillers or artificial pigments. Available Pellet Size: 3 mm Pellet Type: Floating sticks. Recommend for: South, Central American cichlids or any other types of carnivore and omnivore freshwater fish. Available Sizes: 250 g / 500 g