Natural Gravel Bairaman, 0,1 - 0,6 mm
Natural Gravel Kongo, 10-30 mm
Natural Gravel Mekong, 0,1-1,4 mm
Natural Gravel Okavango, 4-8 mm
Natural Gravel Okavango, 8-12 mm
Natural Gravel Rio Branco, 0,1-2 mm
Natural Gravel Rio Xingu, 2-22 mm
Natural Gravel Bairaman, 0,1 - 0,6 mm
Natural Gravel Kongo, 10-30 mm
Natural Gravel Mekong, 0,1-1,4 mm
Natural Gravel Okavango, 4-8 mm
Natural Gravel Okavango, 8-12 mm
Natural Gravel Rio Branco, 0,1-2 mm
Natural Gravel Rio Xingu, 2-22 mm