Your fan seems to only be blowing on a small area of the water surface, for fans to have better cooling efficiency, they should be angled to blow across a larger area of a tank (the more air flow and wider surface area the better the cooling). You'll need to check the tank thermometer to see how effective the fan is.
Btw, your tank looks like a freshwater tank setup... clownfish are saltwater marine fishes, they will die in freshwater environments.
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