Why is it important too have a thermometer in my freshwater aquarium?
Aquarium thermometers let you know if your heater is working and the temperature of your water. Maybe someone accidentally turned the heater temperature dial up and you didn’t notice. If you did not have a thermometer in the water, you would have never noticed that the temperature raised and your fish would have been dead. Aquarium thermometers give peace of mind that the temperature is at a safe level for your fish. A small investment that can pay off and gives you peace of mind. You should place your thermometer at the opposite end of the aquarium as the heater, this way you have an idea of the general water temperature. Of course if a fish is too cold, they will seek out the heat source and congregate around the heater, if you see this, you might want to turn the temperature a little higher.
