I visited an aquarium shop recently and found, to my surprise, a heater submerged in one of the tanks containing goldfish. Knowing that the goldfish is a coldwater species, I asked the shop owner why he found it necessary to place a heater in their tank.He explained that this was because the weather had turned colder in recent months. Changes in temperature can be stressful for the fish and cause them to fall sick more easily.

Fish are cold-blooded animals; that is, they do not possess the natural ability to raise or lower their body temperature to compensate for changes in the surrounding temperature. Instead, they rely on the temperature of the water to maintain their body temperature.

Thus, fish hobbyists may need to turn to heaters and chillers to help them ensure that an optimum water temperature in their fishes’ living environment is maintained.

Do You Need a Heater or Chiller for Your Aquarium?

Maintaining an aquarium, steady water temperature for your fish can be quite a challenge as various factors have to be taken into account.

What Kinds of Fish or Reef Organisms Do You Keep?

Whether procured from the ocean or captive-bred, different species of fish and reef organisms thrive in different water temperatures. It is therefore important to learn about the natural habitats of your aquarium inhabitants and avoid keeping species with wide-ranging requirements.

Other factors include the size of your aquarium, the room temperature, the amount of heat generated by the aquarium light tubes or household appliances placed near the tank.

If a heater is to be used, get one that provides a consistent distribution of heat throughout the aquarium, especially in larger setups.

In hotter weather conditions, run an air-conditioner in the room or add a chiller to the tank.

What Can Happen with Higher Temperatures?

Unlike open water, a closed system like an aquarium is more susceptible to problems in warmer conditions.

Higher tank temperature may mean excess metabolic wastes to deal with, uncontrollable algae growth and fish diseases due to bacteria that thrive in such conditions.

Warmer water also contains less dissolved oxygen. This could cause the aquarium inhabitants to suffocate. This problem can be alleviated through the use of equipment to provide good aeration and water movement.

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