Walt Smith Reef Rock 2.1 NanoWalt Smiths Reef Rock 2. 1. This beautifully colored and uniquely shaped aquarium rock is helping to reduce the impact on wild harvested live rock. Whether you're establishing a new aquarium, or topping off an existing aquarium with this affordable, beautifully manufactured aquarium rock, your aquarium will be filled with a diversity of shapes and colors once you have completed the curing process. This Fijian hand crafted aquarium rock is manufactured