Royal Blue Danio Fish Care

Royal Blue Danio Fish (Danio kerri) is also known as blue danio, Kerr’s danio and Turquoise danio. They originate from the slowly moving streams and floodplains of southern Thailand. They are similar to Zebra Danio and are quite similar. But, in my opinion, they are more beautiful than regular zebra danios.

Blue Danio Description

Royal blue danios have a bright and strong blue color, when they are fully grown, which gives these fish a very unique look. I have had them in my fish tank as well and they looked magnificent! Their blue sleek lines look even more amazing in a live aquarium. But the looks depend very much on the breeding and from where exactly this danio fish comes from. There are variations, where there is little blue color, body is mostly colored in a greenish lime color, but, as I have seen in pet stores, they still look very nice.

Royal blue danio

Royal blue danios grow in size up to 1.7 inches. They are very hardy, a good choice for beginners and smaller fish tanks. They are schooling fish that can live up to 8 years, but 5 is the average lifespan of blue danio.

Green Danio kerri

Property Value
Name Blue Danio
Diet Omnivore
Size Up to 1.7 inches
Temperature 72°-77°F
pH level 6.5-7.5
Min. Tank size 10 gallons
Temperament Peaceful
Activity Very active
Swimming levels All levels
Care level Very Easy

Blue Danio Care

These tropical fish enjoy water temperatures of 72°-77°F and a pH level of 6.5-7.5. As they are small in size, they can be kept in a 10 gallon aquarium. Just remember that they are schooling fish, so have at least 8 of them.

They should be placed in a well planted aquarium. They enjoy running together in schools through and around aquarium plants. The more you have, the more active they become. They enjoy a substrate of rocks of different sizes and gravel.

It is great if your aquarium has a filter that creates a decent amount of flow, resembling the flowing water of the river. It will create a similar habitat of the one they come from.

Also, you should have a tightly fitted cover for your aquarium, as the royal blue danios are jumper fish.

Blue Danio Tankmates

Blue danios are very peaceful and make a great community fish for your aquarium. As mentioned, they are schooling fish, so having at least 8 other blue danios is a must, to not stress them out and keep their activity high. The more the better, as long as your aquarium size allows it. Having more of them will improve their strong blue colors, as they will be trying their best to impress the female danios.

Although they are very friendly fish, you should remember that they are quite small in size, so they should be kept together with fish of similar size, to not get eaten by the bigger ones.

And because blue danios are quite hardy, they can easily be placed in one tank together with tetras, rainbowfishes, livebearers, catfishes and loaches.

Blue Danio Diet

These freshwater fish are not picky eaters, so they will eat most of the foods you give them. Additionally to algae based foods, they should be fed with organic foods as well, because in nature they usually feed on insects. So make sure you give them some bloodworms and brine shrimp from time to time.

They eat the food off the water surface, so above mentioned foods will be great for them.

Blue danio breeding

Royal blue danios are egg-scatterers and do not care for their newborns. If fish lives in good conditions, like a well planted fish tank, then you may see newborns appearing without any human intervention.

If you wish to increase the size of fry, then your aquarium should be well planted with Java moss, wool mops or a spawning grid.

You should keep the water a bit more acidic, close to neutral and have water temperature near the upper recommended temp for this fish.

When you see that the females are full of eggs, you should place them in a separate fish tank that is half filled with water. After that, add small amounts of cool water. This should be done every few hours, until the tank is filled. Additionally to that, you should feed frozen and live foods to them every few hours as well.

When you see that these tropical freshwater fish have laid eggs, remove them from the spawning aquarium, because in time they will eat any eggs they find. At this point, make sure you are using a mature sponge type filter, to avoid any of the eggs getting sucked in.

Incubation depends on the temperature. Usually it takes up to 36 hours to see the new fry swimming around.


These are the things you need to know to care for royal blue danios! They are really beautiful and interesting fish to have. Also, I don’t think they are very popular as well, for some reason. If your friends are aquarists as well, you can surprise them by adding these beautiful fish into your aquarium

If you are on the lookout for new fish, be sure check out these tropical freshwater fish as well.

And be sure to share this with your friends too, maybe they are looking for a new addition for their fish tank? Also subscribe to our mailing list at the bottom of the page, to keep updated on interesting fishkeeping articles.