The term 'microfauna' literally translates to “small animals”, and refers to small arthropods, such as springtails and isopods (aka rollie-pollies, pill bugs, wood louse). These invertebrates serve several important functions in the home vivaria: they act as tank janitors, helping to break down dead plant matter and uneaten food. They also provide the vivarium inhabitants with an extra in-house snack, and aid in nutrient cycling. This week, we will focus on isopods, also known as rollie-pollies, potato bugs, pill bugs, and wood louse. Isopods inhabit most anywhere in the world, but for the purposes of the vivaria, mainly tropical species are used.