Do Goldfish Need A Heater: Temperature Guide | Aquascape Addiction

Do Goldfish Need A Heater: Temperature Guide

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Is a heater really necessary for your goldfish tank? it actually depends on the type of goldfish, here is what you need to know including the ideal temperatures for these fish.

Do Goldfish Need A Heater: Temperature Guide

If you are planning on getting a goldfish, there are some basics you will need, such as a tank, substrate, lights, some plants, a filter, and more. That said, do goldfish need a heater?

You might be surprised to know that many types of goldfish are cold water fish and therefore do not need a heater. That being said, not all goldfish are cold water fish, and therefore some of them do require a heater but it depends on type of goldfish you have, or are planning to get.

What Temperature Do Goldfish Like?

Goldfish temperature

Goldfish do require the water to be at a certain temperature to be happy and healthy. The ideal temperature for goldfish tank water should be between 65 and 74 degrees Fahrenheit.

Specific species of goldfish, such as shubunkins and comets can live in water as cool as 60 degrees Fahrenheit.

How Can I Check my Aquarium Temperature?

The best way to check the temperature of your aquarium water is to use an aquarium thermometer.

These are simple and inexpensive little devices designed to measure aquarium water temperatures. You may also opt to get an aquarium heater with a built in thermometer.

What Temperature Is Too Cold For Goldfish?

Generally speaking, your average fancy goldfish need water no cooler than 65 degrees Fahrenheit, although as mentioned above, some specific species of goldfish can handle water as cool as 60 degrees.

Which Types of Goldfish Need a Heater?

There are several types of fancy goldfish that require a heater to be happy and healthy. These mainly include fancy goldfish types.

Some of the most common types of fancy goldfish that require a heater include;

  • Tosakin.
  • Pom Pom.
  • Froghead.
  • Celestial Eye.
  • Butterfly.
  • Izumo Nankin.
  • Bubble Eyes.
  • Orandas.
  • Lionheads.
  • Tamasaba.

Most of these types of goldfish like their water to be somewhere between 65 and 75 degrees, which means that you will probably need to get a heater for them.

Best Heaters for Goldfish – Our Picks

Here we have three nice little aquarium heaters for you to take a look at that we feel are some of the best options for Goldfish. These are small and simple, enough for goldfish, but nothing too massive or intense.

1. Fluval M Submersible Heater

Here we have a simple and basic aquarium heater, one that is submersible as the name implies. Yes, it can be fully submerged in your tank without fear of breaking.

This unit is made out of shock resistant glass, complete with a high density ceramic heating element, so it should be totally safe for your aquarium.

What is cool is that this heater is made with reflective technology to reflect the surrounding colors, thus making it blend in much better.

Keep in mind that the Fluval M Submersible Heater comes in a 50, 100, 150, and 200 watt model, with the 100 watt option probably being best for goldfish tanks.

This thing takes up virtually no space, which is nice, plus all you need to do is plug it in and mount using the included hardware. Also, the Fluval M Submersible Heater is adjustable in terms of the temperature range.

  • Space friendly.
  • Adjustable.
  • Durable.
  • Easy to use.
  • Blends in well.
  • Not overly accurate.
  • No safety shut off.

Check the current price at Amazon

2. Aqueon Preset Heater

This is another simple submersible heater, however, instead of having a temperature dial to set the temperature, it features a pre-set temperatures. It’s set of 78 degrees, which is slightly on the warm side of things for goldfish, but should still be fine.

Keep in mind that the Aqueon Preset Heater comes in 50, 100, 150, and 200 watt, models, with the 100 watt model being ideal for 20 to 30 gallon goldfish tanks.

For safety, this unit does include an automatic shut off function, so if it or the water gets too hot, it turns off to prevent damage.

The Aqueon Preset Heater is designed with a shatter resistant and shock resistant construction, although it’s not the most durable unit, It does also come with an LED indicator to show you whether it is off or on.

  • Easy to use.
  • Space friendly.
  • Easy installation.
  • Auto shut off function.
  • Durable enough.
  • LED indicator.
  • Not adjustable.
  • A bit on the warm side of things.

Check the current price at Amazon

3. Mylivell Aquarium Heater

This is another great option to keep in mind, as this one is adjustable. Using the temperature dial, this unit can be adjusted from 65 to 93 degrees, which is more than good enough for goldfish tanks.

It’s not the most accurate in the world, but accurate enough to be safe and effective.

The Mylivell Aquarium Heater comes in 50, 100, 200, and 300 watt models, with the 50 or 100 watt models generally being ideal for most tanks. We do like how this unit is very small and space friendly, so it doesn’t eat up too much real estate in the tank.

This heater is fully submersible, and yes, it is made out of fairly high quality materials, so it shouldn’t shatter, break, overheat, or shock your fish. The included suction cups make mounting quite easy.

  • Various power levels.
  • Fully adjustable.
  • Safe and durable.
  • Easy to mount.
  • Space friendly.
  • Could be more accurate.

Check the current price at Amazon

How To Care For Goldfish During Winter

Seeing as most goldfish are cold water fish, there is really nothing you need to do for them in the winter. Well, this is assuming that you keep your goldfish indoors.

As long as your home is decently heated and at around room temperature, the ambient room temperature should be more than enough to keep the goldfish tank water at the appropriate temperature.

That said, if you have a type of goldfish that requires the water to be slightly warmer, you will probably want to get a heater.

Sure, during the summertime, the ambient temperature should be enough to heat the water to an ideal level for warm water goldfish, but this will certainly not be the case during the cooler times of the year.

How Can I Adjust My Goldfish Tank Temperature?

There are a few different methods for adjusting aquarium water temperature, either up or down, so let’s take a look right now.

  1. Of course, the number one way to increase the water temperature of a goldfish tank is to use a heater, ideally one where the temperature can be adjusted.

  2. If you need the tank to be a bit warmer, and you don’t want a heater, another option is to get a slightly stronger aquarium light, or to move the existing light closer to the water. Lights do give off heat, so this should help, although be careful not to overheat the tank.

  3. Another factor that will make a difference in tank temperature is where the aquarium is placed. For instance, if you have the aquarium located in an area that is sunny a lot and has no air circulation, it will increase the water temperature. On the other hand, if the tank is located in a dark area with lots of ventilation, it will help keep the water cooler.

  4. An aquarium hood can make a difference too, or in other words, a lid. If you put a hood on your aquarium, it will keep a lot of the heat inside, whereas not having a good allows a lot of heat to escape.

  5. Keep in mind that the more surface are of water your aquarium has, the faster the heat will dissipate.

Don’t Forget Other Tank Mates

Something that you always need to remember when it comes to goldfish is that other tank mates may not have the same temperature requirements.

Of course, goldfish are cold water fish, but many aquarium fish that you will find in shops are warm water fish. You cannot put warm water and cold water fish in the same tank.

If warm and cold water fish are compatible, you may be able to pull it off by keeping the tank at a moderate temperature, just cool enough for cold water fish, and just warm enough for the warm water fish.

The bottom line is that you need to pay attention to the temperature requirements of all fish you plan on putting in the same tank.


Do My Goldfish in My Outdoor Pond Need a Heater?

Goldfish, such as the common goldfish, fancy goldfish, and other members of the carp family, such as koi, are quite comfortable in cold water.

Most of these fish can easily survive in waters as cold as 55 or even 50 degrees, which is indeed quite cold. Ideally, the water should not drop below 60 degrees Fahrenheit, although this is still quite cold.

Therefore, whether or not you require a heater for your outdoor pond depends on where you live. For the most part, no, you will not one, particularly for the spring, summer, and fall months.

However, if you live somewhere the temperature regularly dips below 60 or 55 degrees, then yes, you will want a heater for your outdoor pond.

Goldfish need the water to be at least 55 degrees, and this is the most important factor to consider here.

Can You Put Goldfish in a Heated Tank?

Yes, goldfish can be put a in heated tank, although do remember that these are generally considered to be cold water fish.

Depending on where you live, you may require a heater to get your tank up to this temperature, although for the most part, 70 degrees is what people would consider to be room temperature.

The important thing to note here is that goldfish should not be put in tanks with the water temperature at or above 78 degrees, as they are not big fans of warm water.

Something else that is important to note here is that warm water holds less oxygen than cold water, and goldfish do need a good amount of it.

Always pay attention to oxygen levels in the water when it comes to choosing the best possible temperature.

What is the Ideal Temperature for Breeding?

For many fish, the ideal temperature for breeding is a bit different than the regular ideal temperature.

In many cases, an increase in temperature signals fish that it is time for breeding, and yes, this is the case with goldfish too.


There you have it folks. We’ve talked about what the ideal tank temperature for goldfish is, what types need heaters, if you need a heater, and more.

If you do plan on getting an aquarium heater for your goldfish, we would definitely recommend taking a closer look at the units which we have reviewed here today.