Fish Profile

Longfin Leopard Danios: Everything You Need To Know

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Have you ever thought of petting a Leopard? Funny Right? And, quite dangerous too! Well, if you are a fan of leopard but cannot pet one, no worries because you can get your Leopard Danio fish! There are leopard patches all over their body. What more could you ask for?

The Longfin Leopard Danios are the perfect species to add to your fish tank. It would be the center of attraction for your aquarium. You’ll find these cute little species more interesting to watch as well.

In this article, you’ll get to know all about Longfin Leopard Danios in detail, from its origin to its tank requirements, breeding, care, and so much more!


The actual origin of the Longfin Leopard Danio is simply unknown. Some claim that these species were native to India, and some claim that the Leopard Danios were first discovered in Myanmar, yet no exact region was ever known.

Some people also believed that these species are a mutant strain developed from the Zebra Danios, while some said that they are a mutant strain of the Dwarf Danios or Spotted Danios.

However, later the researchers found that the Longfin Leopard Danios were hybrid species showing a genetic ratio of 3:1 Danio rerio to Danio frankei. Maybe this is why the scientific name of the Longfin Leopard Danio is Danio Rerio Variety Frankei!

You can find more about Danio Fish: Types, Behavior and Care Routine from here.


The Longfin Leopard Danios tend to be short-lived fish. These species have an average lifespan of about 3 ½ years. Though, if you take proper care of your Danios, they can live up to 5 ½ years.

Longfin Leopard Danios Appearance

I should say that these species are the spotted version of the Zebra Danios. As for their appearance, the Longfin Leopard Danios have a slender compressed body and a barbel of each lip. These species have long fins and an extended tail. They have a golden plus brownish body-color with so many bluish-gray spots, like that of a leopard, of course!

Also, if you ever find your Leopard Danio fishes swimming at the top of the aquarium close to the light, you can see their beautiful golden bodies reflecting the light. Trust me; you’ll find it magical!

As for the size, the average length of Longfin Leopard Danios is about 2 inches at approximate. However, they can grow at a maximum of 2.4 inches depending on the habitat that they are kept in. So, if you want your fish to rise above average, you should make sure that your Longfin Leopard Danios have a fish-friendly environment.

Gender Differences

Both the male and female Leopard Danios have two pairs of barbel and similar spots on their bodies, but the females are usually larger than the males. The male Danios appear more torpedo-shaped, while the females may seem to have a larger belly—moreover, the females’ belly balloons when it’s filled with eggs.


The Longfin Leopard Danios are the most peaceful, active, and also a great starter fish for most community tanks. The behavior of these species is no more different than a normal danio fish breed. They are productive, very dynamic, and quick swimmers. You can see your Danio fishes enjoying the strong current in the tank.

Are Leopard Danios Aggressive?

The Leopard Danios are quite aggressive by nature, but you wouldn’t find any problem to blend these cute little fellows with your aquarium pets. You can see them chasing each other around and even nipping their tankmates. But these species are unlikely to hurt one another.

Do They Get Along With Other Fishes?

I must say yes, these species do get along with other fishes. The Longfin Leopard Danios blend quite well in community tanks. And, it’s not a bad combination to have different species of fishes in a single tank. You have to be quite picky while picking the perfect tankmates for your Leopard Danio fish, just to be sure!

Fishkeeping Difficulty

Longfin Leopard Danios are a great choice if you are a beginner aquarist. These species get along quite well with their tankmates.

The plus point you can get is that these species can tolerate dynamic water conditions without any issues and can even be kept without a heater.

The Leopard Danios are very easy to feed too. These fishes will eat anything you offer them, as long as it floats on the water surface. Hence, keeping the Longfin Leopard Danio in your fish tank is not difficult at all.

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How Many Leopard Danios Can I Keep Together?

The Longfin Leopard Danios are the type of shoaling species. You must keep them in a group of at least 5 to 10. You can determine the number of fishes depending on the size of your fish tank. Five danios are likely to be cramped in a 10-gallon aquarium.

Why Are My Danios Chasing Each Other?

The Leopard Danio, if not kept in school, will often become stressed and may begin to display aggressive nature towards their tankmates.

If you keep too few Danios in your aquarium, they are likely to chase and harass the other fishes too and may turn to fin nipping!

So, the reason why your Leopard Danios are chasing each other is maybe that you have an underpopulated aquarium.


In addition to the elegant and attractive patterns of the Longfin Leopard Danios, they have a quite good reputation for being playful as well.

As said earlier, these species get along really well with their tankmates. You just have to make sure that their tank mates are as equally playful and non-aggressive as the Longfin Leopard Danio!

Also, these species can nip the fins of some fishes with long flowing fins like the Angelfish, Bettas, and others. Good potential tankmates for the Longfin Leopard Danio may include Zebra Danios, Swordtails, Mollies, Small barbs, and other danios.

Can I Keep My Leopard Danios With Tetras?

There is absolutely no reason why you shouldn’t keep your Leopard Danio with Tetras. You won’t have any problems housing them together as both these species are social non-arrogant shoaling fishes.

You could just blend these two and watch as your fishes get comfortable in the tank. In no time, you can see them playing and swimming around!

Habitat And Care

The Longfin Leopard Danios are more comfortable in a habitat that is similar to their native conditions. These species mostly prefer moving waters as they are habituated in the lower reaches of streams and canals in nature. You can set up a planted aquarium for your Leopard Danios so that they can get a feeling of their natural habitat.

As for the ideal water condition for the Leopard Danios, you must keep the water temperature between 70°F to 78°F. Adjust the pH level above 7.0 and below 7.8 and maintain alkalinity between 3° and 8° dKH (50 ppm to 140 ppm).

Note: Do not keep the water temperature too low, or the Leopard Danios tend to become quite vulnerable and susceptible to disease.

Diet And Feeding

The Leopard Danios are omnivorous. You can either feed them a meaty diet or plant matters. The species eat anything you feed them, so that may be a plus point for you!

Significantly, the danio fishes enjoy fresh vegetable matters and live invertebrates like

Note: If you want your danios to be healthy, feed them once or twice a day.

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How Long Can My Danios Go Without Food?

What about my fish? How long can my fish live without food? If you’re going on a vacation, you’ll probably have these questions over your head!

Well, almost any fish can normally live from 2 to 3 days (or even more than that) without fish food.

Many experienced aquarists even leave their fishes for two to three days without making any provisions for feeding.

As for Longfin Leopard Danios, they can go for two weeks without eating. Quite a strong fish, right!

I have written quite a similar article on How Long Can Goldfish Go Without Food. Check it out!

Tank Setup

You must be very specific while choosing tanks for your fishes or fishes for your tank!

Tank Size

The Leopard Danios can grow approximately up to 2.4 inches, and they must be kept in groups of a minimum of five fishes. So, you’ll probably need a fish tank of at least 10-gallon for them.

Water Temperature

Technically, the Leopard Danios are considered to be cold-water fish. However, these fishes need a temperature of around 70°F to 75°F, so you may need a heater to regulate the water temperature.

A good heater for Leopard Danios would be hygger 50W Mini Submersible Digital Display Aquarium Heater. It is quite flexible with temperature management and easy to operate.


Also, the danio fishes prefer moving waters. So, you might want to add a filter to replicate their riverine habitat.


As for the substrate, use a darker colored one like gravel or marbles. The dark substrate tends to absorb more light and keep your tank warmer. This will also help showcase the color of your Leopard Danios and give them a more natural feel.

Aquatics Aquarium Ohko Dragon Stone Rock Mixed Sizes could be a great addition to your tank.

Note: Always keep a secure lid on your fish tank to prevent your danios from jumping out!

Can Leopard Danios Live Without Filter?

The Longfin Leopard Danios are one of the few fishes which can survive without an aquarium filter. Aquarium filters are just an option to create a strong current for the Danios. This might be a reason why Leopard Danios are just perfect for those who are budget conscious.

Longfin Leopard Danios Availability

The Longfin Leopard Danios are widely so popular that they are readily available and inexpensive as well. You can find these species in the nearest aquarium stores, online, and even through mail order.


Leopard Danios are very easy to breed. Sometimes, breeding may even occur in an accident, and you won’t even know! Unlike other fishes, the male Longfin Leopard Danios stay faithful to one female. These fishes form a breeding pair that they often keep for life.

Like most fish species, the Leopard Danios also fertilize externally. The female danios release their eggs in open water, and then the males fertilize them. The eggs will sink to the bottom of the tank and falls through the substrate. The fish fry will rise out of the substrate after around seven days or so.

Though breeding the fishes may not be difficult, extra care is required to raise the fry to adults. There is a huge possibility that the parents can make a snack out of the fry.

Therefore, you must constantly feed the parents so they won’t devour the fry. You can even try removing the parents from the tank. This might increase the chances of fry to survive.

You can check our article on ‘The Easiest Way To Set Up a Fry Tank’ for more details.

Longfin Leopard Danios Disease

The disease is not usually a problem for the Longfin Leopard Danios as these fishes are very less susceptible to any disease.

However, the fins may be extra sensitive to fin rot and other such diseases. If the fins develop enormous tears, you can add a fin repair medication as soon as possible.

Also, adding new fishes, plants, or substrates may increase the risk of introducing disease. You must properly clean, quarantine, or isolate the new additions to not disturb the balance of the fish tank.

You can get additional insights on Treatment and Home Remedy for Fin Rot Disease in Aquarium Fish here.

Are Leopard Danios Suitable For My Aquarium?

The Longfin Leopard Danios are not only beautiful and alluring but also easy to take care of. Their energetic hues and active behavior will make your fish tank stand out.

The addition of the Danio fishes in your aquarium is sure to put a grin on anyone’s face. You just sit down and watch these cute species going all around and playing with each other. So, it’s obvious that these fishes are suitable for your aquarium.


As you have reached down here, you must be quite aware of the fact that the Longfin Leopard Danios are the perfect ones for both beginners as well as experienced aquarists.

These species are so beautiful that they would make your aquarium the center of attraction. So, why not? You just need to give a little extra care if you happen to see any torn fins or so.

I recommend you to add these cute little species to your fish tank and make your fish tank a little more extra! You can show off your mini leopards with fins to your friends too! Happy Aquarium!


Are Leopard Danios Fin Nippers?

Well, yes! Longfin Leopard Danios can be fin-nippers depending on their tankmates. If you keep your danios with the fishes with long fins like Angelfish and Betta, they are likely to nip off their fins.

Why Is My Leopard Danio Fat?

There might be a chance that your Leopard danio is pregnant. If not, then it’s obvious that your leopard danio is constipated. Try feeding it frozen peas to unclog.

How Do I Know If My Danio Fish Is Pregnant?

The female danios are usually fatter than the males, so it might be quite challenging to tell whether your fish is pregnant or not. However, if your female danios look more comprehensive than usual, there is a chance that is might be pregnant.

Why Are My Longfin Leopard Danios Dying?

A lot of times, aquarists are not aware of the poor water quality, air circulation, and chemicals that are present in the water. The Longfin Leopard Danios, although a hardy fish, are likely to die from over chemicals in the water. I suggest renewing your tank filtration for this.

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