Apart from bettas, goldfish, and a few others, all the freshwater fish available on today’s market are said to be tropical fish.
All tropical fish require a water temperature that ranges from 70°F to 86°F (21°C to 30°C). Most will do best at a water temperature that is nearest 78°F (25°C).
Also, keep in mind that no fish will tolerate rapid swings in temperature, so try to keep your water temperature as stable as possible! For those of you who have read the Kick-Ass Aquarium, you are very familiar with the concept of aquarium stability, and you’re probably grabbing your head in angst while thinking, “yes; we know about aquarium stability!”
Nonetheless, I will continue to emphasize the fact the, yes, stability is key! This is, after all, the most important thing to know about aquarium keeping.
When it comes to water temperature, a submersible heater with a temperature-control dial is the very best design at promoting stable aquarium conditions.
Still, less effective options do exist. For reasons that are unbeknownst to me, many aquarium shops continue to sell heaters that are not fully submersible and ones that do not have a temperature-control dial!
For the benefit of those who may have purchased one of these older heater designs, I’ll briefly go over the proper way to set them up.
The older heaters lack a temperature controller. You must, therefore, calibrate the heater’s thermostat – the mechanism that gauges water temperature and turns the heater on or off based on the temperature reading.
So, here it goes.
1) Always read the directions on the heater packaging before placing the heater in your aquarium!
2) BEFORE YOU TURN THE HEATER ON, you must first position it inside your aquarium. For hang on the back heaters, the glass tube ought to be positioned beneath the water line. Fully submersible heaters, on the other hand, should be completely enveloped in water.
The heater must be submerged accordingly for a period of fifteen minutes BEFORE you plug it in! During this fifteen minute period, the thermostat in the heater adjusts to the water temperature.
3) After fifteen minutes is up, you can go ahead and plug the heater in. You should then turn the temperature dial, which is usually located at the top end of the heater, all the way up. An indicator light will turn on; this means the heater is on.
4) Pay close attention to the temperature reading on the thermometer (you should always have a good aquarium thermometer in your fish-tank). Once the temperature rises to 78°F (25°C) or to the desired temperature (a process that may take two or more hours), slowly turn the temperature dial down, just until the indicator light turns off.
Congratulations! You have now set the thermostat. The heater will automatically turn on any time the water temperature falls below the level you set the thermostat to.
If you want to save yourself the above trouble, just buy a heater with a temperature controller!
*Also note that you should never turn any aquarium heater on while it’s dry! In fact, even if you need to take a running heater out of the aquarium, you should turn it off and wait until in cools before removing it from the aquarium!
Thank you for reading, and I hope this information proves useful:)