Their are are very different options for ground covering. In most cases they use sand, but also many other types of soil coverings are suitable as; corn grains, calcium granules. Below we will describe the two types of ground cover we have experience ourselves.
Terrarium sand: You can buy special terrarium sand in pet stores, often in different colors. The sand should not be too fine or dusty. This kind of sand is less suitable. The animals will become covverd under the dust and they mide even breath the dust in small quantities, which can be harmful for the health.
Terrarium sand is very suitable as bottom material. Somthimes the bearded dragon brag a lot of sand, when cathing their food. This is smething to watch out for when you use sand as ground covvering. Too much sand can lead to clogging. The can´t digest sand and theirfore it can cause blockages. One can solve this simple by feeding the bearded dragons separated.
One can also use bird sand. This often has a fresh smell and is´t dusty at all. Bird sand is not harmful if accidentally intake (small bits), however, large amounts can also cause blockages as described above.
Maiskorrels: This ground covers is´t dusty at all, and is made of natural material. The grains give a nice effect. The grains past around the stools, which makes the stool easy to remove. However, the grains are not resistance against moisture. Don´t get it too wet, then there is a chance for fungus.