Aquawind Eco Chic Aquarium Fan - Tunze
Effiecient, Quiet, and Safe Aquarium Cooling Low-noise ventilator Easy to install Tilt adjustment to direct airflow Mounts on glass up to 0.866" thick IP57 Water resistant 12V DC low voltage for safety Energy efficient with only 1.7W power consumption Only one fan needed, even for large...
www.bulkreefsupply.com
are they for real when they say this can cool a 211 gal tank?