The TetraFauna ReptoFilter Internal Terrarium Filter is designed to efficiently filter water in terrariums up to 20 gallons in size. With a flow rate of 90 gallons per hour, this filter effectively removes debris and contaminants from the water, providing a clean and healthy environment for your aquatic pets. Its internal location makes it easy to install and maintain within your tank, ensuring a sleek and organized setup for your fish or aquarium animals. With the TetraFauna brand reputation for quality, this ReptoFilter 90 GPH model is a reliable choice for maintaining a clean and clear water environment.