I was just planning on a couple 12V
PC fans.
I was wondering if there might be anything like this simple heater controller for a fan?
http://www.marinedepot.com/md_viewIt...roduct=HD03301 This could probably also be rigged up with a normally on relay, so that when the tank warmed enough the heater controller would turn off and the relay would close to turn on the fan. Seems silly but I haven't seen anything else to do the trick wihtout building a circuit or going overkill. Of course don't know exactly what the outputs and capacity of this device is...
Also a regular thermostat controlled fan could be used. I'm not sure about extending the therm on a lead to the tank, but just based on room temp you could experiment to get near the right point to have it kick on when needed?
