Updated On June 9th, 2017
Pet's info: Fish | Unknown - Fish | Male
Answered By Lauren Barry, BVSc, MRCVS, DVM 138
Veterinarian
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I would recommend using an aquarium thermometer to check the starting temperature and that the heater is working correctly. The heater should have a thermostat which switches on and off to keep the temperature constant. You can leave your fish in the tank during this process if you can monitor with a thermometer.
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