Need to drop 3-5 degrees without wanting to purchase a chiller? The C-BREEZE Adjustable Clamp-On Air Blower is the answer for nano aquariums that require 3-5 degree drops in temperature.
This innovative centrifugal fan quietly cools with a powerful wide mouth stream of air to speed up evaporative cooling.
see here:
http://www.aquacave.com/jbj-c-breeze...-fan-2627.html

New In Box. Asking $25 JBJ C-Breeze