OASE BioStyle Thermo is a sleek, compact power filter, ideal for marine and freshwater aquariums. This hang on back filter includes two multi-stage filter cartridges and two biological filter foams to ensure optimal water quality and clarity. The easy to see cleaning indicator lets you know when it is time to change the multi-stage cartridges or clean the biological filter foams. The filter's design allows for customization of filter media that can be easily replaced within the filter at any point, based on aquarium needs. BioStyle filters are designed for easy installation, with an adjustable leveler foot for securing the filter to different thicknesses of aquarium glass and with a telescopic intake for varying aquarium heights. The filter’s built-in adjustable flow control allows you to change the intensity of water movement in your aquarium. This BioStyle Thermo filter reduces the amount of additional equipment seen in the aquarium by integrating a heater into the filter unit. Designed with German engineering and manufactured in Italy, this quiet and energy efficient filter is backed by a 3-year warranty.