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.