[Blowing a fan when using a chiller is a double edge sword. It can help to cool down you tank or heat it up .
Cool down your tank by blowing the heat from your lamp away .
Heat it up by blowing warmer room temperature to your tank.]
--> I try to add a fan blowing the water surface, monitor the different, will update here the result.
[thats really crappy temp. you have to minimise heat in to your tank. I.e insulate your piping ,cold side of your chiller.]
--> I have insulated 3 sides of my tank and canister filter body with aircond heat insulator sheet, then the piping also insulated with aircond pipe insulator.
[how hot is your heatsink at the moment ? warm air is been blown out ? or just slightly cool air ?]
--> didnt scan the heat side temp, but can feel better than last time as now i'm using full copper 67 fins heat sink,
http://www.thermaltake.com/product/c...1/cl-p0001.asp
can feel the cold side cooler than before, but still cant get the temp down to 24C, a sad thing