Tropical Fish Temp. The most ideal tropical fish temperature is 74f and 79 f. And remember to maintain an average of 80 degrees fahrenheit.

Is 27 degrees ok for tropical fish? I know what you are talking about re heaters, i spent good money on 2 300w heaters (close to top of the line) for my tank some time back. And remember to maintain an average of 80 degrees fahrenheit.

Fresh Water Tank Temp. While changing the water, make sure the freshwater has at least 70 degrees fahrenheit temperature. You are right in saying that research needs to be carried out though.

The water temperature in your aquarium has a bigger role than you may think. The average tropical fish temperature for home aquariums is 77 degrees f. As long as the water temperature does not remain above 86 degrees fahrenheit and 30 degrees celsius for weeks on end, you need not be concerned.