What Is the Ideal Temperature for Discus?

What Is the Ideal Temperature for Discus?

In fact, there is a wide debate in the aquarium world about what is the best temperature for keeping discus aquarium. And you may be asking yourself, “Why is there so much debate on such a seemingly small topic?”

The explanation for this is that discus is a tropical species from the Amazon River basin. Thus, they can endure a wide range of aquarium water temperature in their natural environment, which ranges from 82 to 86 degrees Fahrenheit.

In this article, I’ll go over the different points of view on what is the suitable temperature for discus aquarium, as well as give you my opinion on the matter!

What Happens If the Water Gets Too Cold?

Can you withstand sitting in a cold tub of aquarium water for hours on end? I’m guessing probably not. The same goes for your discus aquarium! If the water gets too cold, they will be lethargic and stop eating. In severe cases, they can even develop diseases and die.

The main reason for this is that cold water slows down their metabolism, which means that their bodies are not able to function properly.

Therefore, you should avoid putting your discus aquarium in water that is below 82 degrees Fahrenheit, or you will end up with a pile of frozen fish!

What Happens If the Water Gets Too Hot?

Sometimes you can get fooled by thinking that if a little bit of something is good, then a lot must be even better! But that’s not always the case.

Just like humans, discus aquarium can also suffer from heat stroke if the water gets too hot. In fact, they are even more susceptible to it since they are cold-blooded creatures.

When the water temperature rises above 86 degrees Fahrenheit, your discus aquarium will start to suffocate since hot water holds less oxygen than cold water. They will start to gasp for air at the surface of the water and their fins will become clamped.

And if this high temperature persists, their bodies will begin gradually shutting down and they will eventually die.

Note: If you overheat your tank, do not put ice or cold water in it. Instead, add a few more air stones to aerate your water and cool it down while also supplying more oxygen.

How to Know If the Temperature Is Too Hot or Too Cold?

You can tell if the water is too hot or too cold by observing their behavior. If they are sluggish and not eating, then the water is probably too cold. On the other hand, if they are gasping for air and their fins are clamped, then the water is most likely too hot.

Another way to tell is by using a thermometer to measure the temperature of your tank. I would recommend getting an aquarium thermometer that you can suction onto the side of your tank.

Further, you can use a heater with a built-in thermometer to help you keep track of the temperature. I would recommend the Cobalt Aquatics Neo-Therm Heater, which has a temperature range of 68 to 94 degrees Fahrenheit and an accuracy of +/- 0.5 degrees.

How Can I Heat up My Tank?

There are a few different ways that you can heat up your discus, but the most popular and effective method is to use an aquarium heater.

When it comes to heaters, there are a lot of options on the market. However, you should choose the appropriate size heater for your tank.

Also, I recommend getting a heater with an adjustable temperature setting so that you can fine-tune the temperature of your tank. Plus, make sure to get a heater with an automatic shut-off feature in case it overheats.

Another way to heat up your tank is to use a heat lamp. However, you should only use this method if you are only trying to raise the temperature by a few degrees since it can be difficult to control the temperature with a heat lamp.

Finally, you can acquire a fish tank with a built-in heater. This will spare you the trouble of having to purchase a separate heater and will eliminate the difficulties of where to place your heater in your aquarium.

When Adding New Water To My Tank, How Should I Regulate The Temperature?

When changing your tank’s water, you may want a heater to raise the new water to the correct temperature.

This is more significant for people who reside in colder regions or who have rooms that are below 70 degrees Fahrenheit.

Water temperatures can very quickly change, which can harm your discus and any other fish.

Therefore, before pouring in the water, make an attempt to get the two volumes at similar temperatures.

Where Should I Locate My Tank?

You should put your aquarium in a spot where it’s not under direct sunlight. The sun could overheat your tank, which could be detrimental to your fish.

Also, you should make sure that your tank is not in a drafty area since this can cause the temperature of your water to fluctuate, which can stress out your fish.

Finally, ensure that your tank is close to an electrical outlet so that you can easily plug in your heater, filter, and other aquarium equipment.

Should I Use a Lower Water Temperature to Grow Aquarium Plants?

The most popular approach to keep discus with plants in your tank is to establish a temperature compromise. To do this, you should maintain a temperature that’s a bit lower for them but a bit higher for the plants.


What Is the pH Level for Discus Fish?

The ideal pH level for discus aquarium is between 6.0 and 6.5. To test the pH level of your water, you can use a test kit or strips.

What Is the Ideal Water Hardness for Discus Fish?

The ideal water hardness for discus aquarium is between 1 and 4 dGH (18 to 70 ppm).

What Happens If the Water Hardness Is Too Hard?

If the water hardness is too high (i.e., above 8° dKH), your discus will have difficulty absorbing oxygen from it and the water will be sticky. In fact, too many minerals in the water will make it difficult to keep your pH stable.

What Happens If the Water Hardness Is Too Soft?

If the water hardness in your fish tank is too low, the water will become unstable and corrosive. This happens because soft water doesn’t have enough minerals to keep the pH levels stable, resulting in wild fluctuations.

How to Raise the pH in My Tank?

You can add crushed coral gravel to your aquarium to help raise the pH in your tank. Also, you can use a buffer solution to raise the pH of your water.

How to Lower the pH in My Tank?

You can lower the pH in your tank by adding driftwood or peat moss to your aquarium.

What’s the Best Way to Keep My Discus Tank Clean?

The best way to keep your tank clean is to do regular water changes. I recommend doing a 25% water change every 1 to 2 weeks. Also, you should vacuum the gravel to remove any waste or uneaten food.

Last Words

As you can see, there are a few things that you need to take into account when it comes to the best temperature for discus aquarium. By following the tips in this article, you can create a comfortable and healthy environment for your fish.

Just remember to keep a close eye on the temperature of your tank and make adjustments as necessary. After all, a happy discus fish is a healthy discus aquarium!

I hope you enjoyed this article. If you have any questions or comments, please feel free to leave them below.

Until next time, happy fishkeeping!