Expanded Clay Pebbles are irregular-shaped pebbles of expanded clay which resemble popcorn. They have an uneven and coarse surface with lots of pores, giving them a huge surface area which allows them to hold lots of water. In addition to this they provide an excellent drainage and are too heavy for ants to lift and move around the nest. Pebble size ranges between 5-20mm and is a common substrate choice for leaf cutting ants.
LC Ants - Ant Keeping Equipment