Rasbora Size: How Big Do Rasbora Get?

Are you curious about the size of different types of rasboras? In this article, we will explore the size of rasboras, including how fast they grow, and which ones are the largest and smallest.

We’ll also look at how size varies by species so that you can get a better understanding of these unique fish.

Harlequin Rasbora

Rasbora Size By Species (Size Chart)

While rasboras are generally known to be small fish, size can differ depending on the species. Here’s a rasbora size chart for comparison.

Rasbora SpeciesSize
Dwarf Rasbora0.75 inches    
Harlequin Rasbora2 inches 
Brilliant Rasbora3.6 inches
Blackline Rasbora2.5 inches
Lambchop Rasbora2 inches
Chili Rasbora0.7-1inch
Galaxy Rasbora (Danio margaritatus)1-1.5 inches
Emerald Eye Rasbora1.6 inches
Phoenix Rasbora0.5-0.8 inches
Scissortail Rasbora6 inches
Neon Green Rasbora0.75 inches
Neon Blue Rasbora0.6-0.8 inches
Strawberry Rasbora0.7 inches
Exclamation Point Rasbora1 inch
Clown Rasbora3.9 inches
Fire Rasbora1.6 inches

How Big Do Rasboras Get on Average?

The average adult rasbora grows up to 1-3 inches in length, with some species growing as big as 5 inches or more.

Of course, this depends on the type of rasbora; some species are larger than others.

The size of a juvenile rasbora is much smaller than an adult—typically between 0.5 and 1 inch long—but they can grow quickly depending on their environment and diet.

Which Rasbora Is The Smallest?

The smallest rasbora species are Dwarf Rasbora, Chili Rasbora, Phoenix Rasbora, Neon Green Rasbora, Neon Blue Rasbora, Strawberry Rasbora, and Exclamation Point Rasbora. These rasboras grow only up to an inch or less, making them perfect for nano tanks.

Due to their small size, these rasboras can easily become prey to other fish, so be sure to choose their tank mate wisely. In general, large fish that are aggressive should be avoided.

While they are great for nano tanks, do keep in mind that these fish do well in groups. Make sure that the tank is large enough to accommodate a minimum of 6 or more fish.

Which Rasbora Is The Largest? 

The Scissortail Rasbora is the largest of the Rasbora family, growing up to 6 inches!

True to its name, it features forked tails and striking horizontal stripes that bring added depth to any tank.

The smaller Clown Rasbora may not be as large, but its orange coloration and deep red eyes make it a captivating choice for freshwater aquarium environments.

It’s definitely an eye-catching little creature, but it doesn’t just look cool; its behavior is interesting too!

These fish celebrate the friendly bonds they form with one another and love to congregate together in large schools.

This is particularly charming when you observe them in a well-maintained tank, as it creates an almost curtain-like wall of gorgeous colors as they swim around with their pals.

The third largest Rasbora on our list is the Brilliant Rasbora, which features golden-green scales and a gold stripe along its lateral line.

For those looking to add some stunning beauty and interesting behavior to their tank, the brilliant rasbora is a worthy consideration.

Plus, because they are such peaceful creatures, they are easy to incorporate into any setup, especially when combined with other similarly-sized fish.

With unique variations in their sizes, shapes, and colors, all three types of these interesting fish are sure to add a special touch to any aquarium!

How Fast Do Rasboras Grow?

Rasbora growth rates vary depending on several factors, including water temperature, water quality, food quality, and genetics.

Generally speaking, rasbora growth is fastest during the first year after hatching when the fish is still young.

After the first year, growth slows down significantly and reaches its peak when the fish is around 2-3 years old before gradually decreasing again.


Rasboras are small fish that make a big impact in the right aquarium.

They come in many beautiful patterns, colors, and sizes, but on average, most grow to be about 1-3 inches long.

As a friendly reminder, aquarists should remain aware that despite their similar size, it is each species has its own care requirements, and while they may look similar, one care routine will not apply universally to your Rasboras.

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