Aqua Natural Turtle and Axolotl Pebble is a predominantly larger type of pebbles ideal for turtles and axolotls. Shaped by ancient glacial flows and the swift rivers of central otago, it is mostly oval. This is an ideal substrate for aquariums wanting a natural southern alpine feel. Can be used for a variety of projects from aquarium and vivarium, reptile enclosures, landscape projects, garden features and much more.