Have you ever looked at a fish tank and felt your eyes widen with wonder? There is something magical about watching colourful fish swim around in clear water. The bright reds, deep blues, shining yellows, and glowing greens can turn a simple glass box into a living piece of art. Many people start keeping fish because they want to bring some of that beauty into their own homes.
But here is the thing: there are so many kinds of colourful fish out there that it can feel confusing. Which ones are easy to look after? Which ones get along with other fish? Which ones will light up your tank the most?
Do not worry. I have got you covered. In this post, we will look at 10 of the most beautiful colourful fish you can keep in an aquarium. I will tell you what makes each one special, what colours they come in, and how hard they are to care for. Whether you are a beginner just starting out or someone who has had fish for years, there is something here for you.
Betta Fish (Siamese Fighting Fish)
If there is one fish that everyone knows, it is the Betta fish. These fish are like the rock stars of the aquarium world. They have long, flowing fins that move like silk in the water. Their colours are so bright and varied that you can find them in almost any colour you can think of: electric blue, deep red, shining purple, white, black, and even combinations of multiple colours.
Male Bettas are the ones with the most impressive fins and colours. They are absolutely stunning to watch. However, there is one very important rule: never put two male Bettas in the same tank. They will fight each other, sometimes to the death. That is why they are called “Siamese Fighting Fish”. Female Bettas can be kept together, but only in a large tank with lots of plants and hiding spots.
Care Level: Easy. Bettas are great for beginners. They can live in smaller tanks (20 litres or more) and do not need complicated equipment. Just keep their water warm (around 26°C) with an aquarium heater, and keep it clean. Our betta fish tank setup guide walks you through it.
Best For: Anyone who wants a single, show-stopping fish that will be the centre of attention.
Guppy (Best Small Colourful Fish)
Guppies are small but they pack a huge punch when it comes to colour. These tiny fish come in an almost endless variety of colours and tail shapes. You can find guppies in bright reds, blues, yellows, oranges, and every mix in between. Their tails can be round, sword-shaped, or even look like a fan.
One of the best things about guppies is that they are always moving. They swim around actively all day long, which makes your tank feel lively and full of energy. They are also very social and do well in groups.
Another cool fact: guppies are livebearers. This means they give birth to live baby fish instead of laying eggs. If you keep male and female guppies together, you will likely end up with baby guppies before you know it!
Care Level: Very Easy. Guppies are one of the best fish for beginners. They are hardy, adapt well to different water conditions, and are inexpensive.
Best For: Beginners who want a tank full of colour and activity.
Neon Tetra
Neon Tetras are small fish that glow. They have a bright neon blue stripe that runs along their body, and a red stripe that covers the back half of their body. When a group of these fish swims together, it looks like a stream of living light moving through the water.
These fish come from South America and are very peaceful. They do best in groups of six or more; the more you have, the better they look and the happier they are. They are perfect for community tanks with other peaceful fish.
Neon Tetras stay small, only growing to about 2.5 to 4 cm long. This makes them a great choice for smaller tanks, though a 40-litre tank or bigger is best.
Care Level: Easy to Moderate. They need stable water conditions, but as long as you keep their tank clean and at the right temperature (around 22–26°C), they will do well.
Best For: Anyone who wants a peaceful, colourful schooling fish.
Cardinal Tetra
Cardinal Tetras look a lot like Neon Tetras, but there is one big difference. While Neon Tetras have a red stripe that only covers the back half of their body, Cardinal Tetras have a red stripe that goes all the way from their head to their tail. This makes them even more colourful. They are slightly larger than Neon Tetras, growing to about 5 cm long. Like Neon Tetras, they are peaceful schooling fish that do best in groups of 6 to 10 or more. Their bright colours and graceful swimming make them a favourite for many aquarium lovers.
Care Level: Easy to Moderate. They need similar care to Neon Tetras: clean water, stable temperatures, and a group of friends. They also cope with warmer water than neons, up to about 29°C.
Best For: People who love Neon Tetras but want something even more colourful.
Discus Fish
Discus fish are often called the “kings of the aquarium”. And once you see one, you will understand why. These fish have round, disc-shaped bodies and come in some of the most amazing colours you will ever see: brilliant turquoise, fiery red, bright orange, soft yellow, and many more.
Their colours are often arranged in beautiful patterns that look like artwork. Many people plan their entire aquarium around a group of Discus because they are so stunning.
However, there is a catch. Discus fish are harder to care for than most other fish on this list. They need very warm water, between 29°C and 30°C. They are also social fish that should be kept in groups of five or more. They grow quite large, up to 15 to 20 cm, so they need a big tank (at least 280 litres for a group). Many keepers also use reverse osmosis water to get the soft water discus need.
Care Level: Difficult. Not recommended for beginners. You need experience and patience to keep Discus fish healthy.
Best For: Experienced fishkeepers who want a truly magnificent centrepiece fish.
Angelfish
Angelfish are elegant and graceful. They have long, triangular fins that make them look almost like they are floating. They come in many colours and patterns: silver with black stripes, koi patterns, marble designs, and more.
These fish are part of the cichlid family, but they are much more peaceful than many of their relatives. They do well in community tanks with other peaceful fish. However, they can be a bit territorial when breeding, so it is good to give them some space.
Angelfish need tall tanks because of their long fins. A 115-litre tank is a good starting size for a pair.
Care Level: Easy to Moderate. They are hardy and adapt well, but they do need clean water and a proper-sized tank.
Best For: People who want an elegant, graceful fish that stands out.
German Blue Ram
The German Blue Ram is a small but stunning fish. It has a golden body covered in electric blue spots, with touches of red around the eyes and fins. When the light hits them just right, they shimmer and glow.
These fish are dwarf cichlids, which means they stay small. They are peaceful and do well in planted tanks with other calm fish. Their colours are subtle but beautiful, and they add a delicate touch to any aquarium. They are a bit picky about water quality, though. They need clean, warm water (around 28–30°C) and regular water changes.
Care Level: Moderate. They need good water quality, so they are better for people who have some experience.
Best For: Fishkeepers who want a beautiful, peaceful fish that is not too big.
Cherry Barb
Cherry Barbs are small fish that bring a splash of bright red to any tank. The males are especially colourful: they turn a vivid, deep red, especially during breeding season. Females are more subdued in colour, but still pretty.
These fish are peaceful and do well in groups. They are active swimmers and add motion and colour to planted tanks. They are also very hardy and easy to care for, which makes them a great choice for beginners.
Care Level: Easy. They are tough fish that can handle a range of conditions.
Best For: Beginners who want a splash of red in their tank.
Boesemani Rainbowfish
Boesemani Rainbowfish are truly something special. Their name says it all: they look like a rainbow swimming through the water. The front half of their body is a bright blue or turquoise, and the back half is a warm orange or yellow. The contrast is amazing.
These fish are active and love to swim in open spaces. They do best in larger tanks where they have room to move. Their colours become even more vibrant as they grow older.
They are peaceful and do well in community tanks with other non-aggressive fish.
Care Level: Easy to Moderate. They are hardy but need space to swim.
Best For: People with larger tanks who want a fish that shows off a range of colours.
Pearl Gourami
Pearl Gouramis are delicate and beautiful. They have silvery-brown bodies that shimmer and are covered in small, pearly white spots that look like pearls. When the light hits them, they sparkle. These fish are peaceful and have a calm, graceful way of swimming. They add a soft, elegant beauty to any tank. They are also relatively easy to care for, making them a good choice for beginners who want something a little different.
Care Level: Easy. They are hardy and adapt well to community tanks.
Best For: Anyone who wants a peaceful, shimmering fish with a unique look.
Conclusion
So there you have it: 10 of the most beautiful colourful fish you can keep in an aquarium. From the flashy Betta to the glowing Neon Tetra, from the elegant Angelfish to the rainbow-like Boesemani Rainbowfish, each one brings its own special kind of beauty to the tank. When choosing your fish, remember to think about more than just colour. Consider how big the fish will get, what kind of tank it needs, what other fish it can live with, and how much care it requires. Some fish, like guppies and Bettas, are perfect for beginners. Others, like Discus, are better left to experienced keepers.
The best part about keeping colourful fish is that you get to create your own little underwater world. You can mix and match different colours and types to make a tank that is uniquely yours. Just make sure all your fish are compatible, need the same water temperature, and have enough space. Whether you are just starting your first tank or adding to an existing one, I hope this guide has helped you find some fish that catch your eye. Remember, the most important thing is to give your fish a happy, healthy home. When they are healthy and comfortable, their colours will shine their brightest. Now go ahead, pick your favourites and start building your own colourful aquarium. Happy fishkeeping!
