The BioPlus Thermo line of internal corner filters with integrated heaters are perfect for medium-sized aquariums. The BioPlus Thermo 100 is designed for discreet corner placement. With the heater integrated into your filter, there is more room for undisrupted beauty in your aquarium. The integrated diffuser with adjustable flow control allow for uniform surface movement, prevents the formation of biofilm, and provides additional dissolved oxygen to the water for ideal water quality. The 3-stage filtration of biological, mechanical, and chemical ensure effective water filtration and optimal living conditions for freshwater aquarium habitats.