Aquarium Topflite Aquatic Gravel Shotover 10kgTopflite Aquatic Gravel Shotover 10kg If you want everything to go swimmingly with your aquarium, don't leave anything to chance. This range of locally sourced aquatic gravels and stones provide the most attractive and healthy home for your fish. With this beautiful Central Otago aquarium stone there is no need to fish for compliments. These blue green pebbles originate from the Shotover river in Central Otago. A natural variation for your aquarium.