Tropical

American Cichlids, colourful tropical fish, buy fish online from Swell UK, fast, specialist deliveryAmerican Cichlids, colourful tropical fish, buy fish online from Swell UK, fast, specialist delivery
Angelfish, great community fish, buy fish online from Swell UK, fast, specialist deliveryAngelfish, great community fish, buy fish online from Swell UK, fast, specialist delivery
Apistogrammas, interesting dwarf cichlids, buy fish online from Swell UK, fast, specialist deliveryApistogrammas, interesting dwarf cichlids, buy fish online from Swell UK, fast, specialist delivery
Barbs, lively, active tropical fish, buy fish online from Swell UK, fast, specialist deliveryBarbs, lively, active tropical fish, buy fish online from Swell UK, fast, specialist delivery
Bettas, great for small fish tanks, buy fish online from Swell UK, fast, specialist deliveryBettas, great for small fish tanks, buy fish online from Swell UK, fast, specialist delivery
Bichirs, oddball fish, great for large aquariums, buy fish online from Swell UKBichirs, oddball fish, great for large aquariums, buy fish online from Swell UK
Catfish, huge variety of catfish, buy fish online from Swell UK, fast, specialist deliveryCatfish, huge variety of catfish, buy fish online from Swell UK, fast, specialist delivery
Corydoras, peaceful bottom dweller, buy fish online from Swell UK, fast, specialist deliveryCorydoras, peaceful bottom dweller, buy fish online from Swell UK, fast, specialist delivery
Crabs, tropical freshwater crabs, buy online from Swell UK, fast, specialist deliveryCrabs, tropical freshwater crabs, buy online from Swell UK, fast, specialist delivery
Danios, lively and colourful tropical fish, buy fish online from Swell UK, fast, specialist deliveryDanios, lively and colourful tropical fish, buy fish online from Swell UK, fast, specialist delivery
Discus, large and colourful tropical fish, buy fish online from Swell UK, fast, specialist deliveryDiscus, large and colourful tropical fish, buy fish online from Swell UK, fast, specialist delivery
Eels, interesting oddball fish, buy fish online from Swell UK, fast, specialist deliveryEels, interesting oddball fish, buy fish online from Swell UK, fast, specialist delivery
Flowerhorns, aggressive hybrid cichlids, buy fish online from Swell UK, fast, specialist deliveryFlowerhorns, aggressive hybrid cichlids, buy fish online from Swell UK, fast, specialist delivery
Frogs, oddball amphibians, great for aquariums, buy online from Swell UK, fast, specialist deliveryFrogs, oddball amphibians, great for aquariums, buy online from Swell UK, fast, specialist delivery
Geophagus, peaceful eartheater, buy fish online from Swell UK, fast, specialist deliveryGeophagus, peaceful eartheater, buy fish online from Swell UK, fast, specialist delivery
Gobies, tiny, interesting fish, buy fish online from Swell UK, fast, specialist deliveryGobies, tiny, interesting fish, buy fish online from Swell UK, fast, specialist delivery
Gouramis, colourful, great for community aquariums, buy fish online from Swell UKGouramis, colourful, great for community aquariums, buy fish online from Swell UK
Guppies, colourful livebearers, great for small aquariums, buy fish online from Swell UKGuppies, colourful livebearers, great for small aquariums, buy fish online from Swell UK
Haplochromis, colourful African cichlids, buy fish online from Swell UK, fast, specialist deliveryHaplochromis, colourful African cichlids, buy fish online from Swell UK, fast, specialist delivery
Killifish, great breeding project, colourful fish, buy fish online from Swell UK, fast, specialist deliveryKillifish, great breeding project, colourful fish, buy fish online from Swell UK, fast, specialist delivery
Knifefish, oddball fish, great for large aquariums, buy fish online from Swell UKKnifefish, oddball fish, great for large aquariums, buy fish online from Swell UK
Kribensis, colourful dwarf cichlids, buy fish online from Swell UK, fast, specialist deliveryKribensis, colourful dwarf cichlids, buy fish online from Swell UK, fast, specialist delivery
Labidochromis, lively African cichlids, buy fish online from Swell UK, fast, specialist deliveryLabidochromis, lively African cichlids, buy fish online from Swell UK, fast, specialist delivery
Loaches, great bottom dwellers, buy loaches online from Swell UK, tropical fishLoaches, great bottom dwellers, buy loaches online from Swell UK, tropical fish
Mollies, colourful livebearers, lots of varieties, sailfin mollies, buy tropical fish at Swell UKMollies, colourful livebearers, lots of varieties, sailfin mollies, buy tropical fish at Swell UK
Oscars, large and personable tropical fish, great for large aquariums, online fish for sale at Swell UKOscars, large and personable tropical fish, great for large aquariums, online fish for sale at Swell UK
Parrot Cichlids, colourful hybrid cichlids, great for large aquariums, online fish for sale at Swell UKParrot Cichlids, colourful hybrid cichlids, great for large aquariums, online fish for sale at Swell UK
Peacock Bass, large tropical fish for big fish tanks, buy fish online from Swell UKPeacock Bass, large tropical fish for big fish tanks, buy fish online from Swell UK
Peacock Cichlids, colourful and lively African cichlids, great for large aquariums, buy online from Swell UKPeacock Cichlids, colourful and lively African cichlids, great for large aquariums, buy online from Swell UK
Pencilfish, interesting community fish, buy fish online from Swell UK, fast, specialist deliveryPencilfish, interesting community fish, buy fish online from Swell UK, fast, specialist delivery
Platies, colourful and active livebearers, great for community aquariums, buy at Swell UKPlaties, colourful and active livebearers, great for community aquariums, buy at Swell UK
Plecos, great algae eaters for community aquariums, buy fish online from Swell UK, fast, specialist deliveryPlecos, great algae eaters for community aquariums, buy fish online from Swell UK, fast, specialist delivery
Pufferfish, interesting oddball fish, buy fish online from Swell UK, fast, specialist deliveryPufferfish, interesting oddball fish, buy fish online from Swell UK, fast, specialist delivery
Rainbowfish, lively and colourful community fish, buy fish online from Swell UK, fast, specialist deliveryRainbowfish, lively and colourful community fish, buy fish online from Swell UK, fast, specialist delivery
Rams, colourful dwarf cichlids, community aquariums, buy fish online from Swell UK, specialist deliveryRams, colourful dwarf cichlids, community aquariums, buy fish online from Swell UK, specialist delivery
Rasboras, tiny fish great for nano aquariums, buy fish online from Swell UK, fast, specialist deliveryRasboras, tiny fish great for nano aquariums, buy fish online from Swell UK, fast, specialist delivery
Ricefish, suitable for unheated aquariums, variety of colours, buy fish online from Swell UKRicefish, suitable for unheated aquariums, variety of colours, buy fish online from Swell UK
Severums, large, colourful community fish, shop fish online at Swell UK, fast, specialist deliverySeverums, large, colourful community fish, shop fish online at Swell UK, fast, specialist delivery
Shrimp, neocaridina and caridina shrimp, buy shrimp online at Swell UK, fast, specialist deliveryShrimp, neocaridina and caridina shrimp, buy shrimp online at Swell UK, fast, specialist delivery
Snails, lots of varieties, apple, assassin, zebra, and more, shop snails online at Swell UKSnails, lots of varieties, apple, assassin, zebra, and more, shop snails online at Swell UK
Snakeheads, striking oddball fish, great for species-only aquariums, tropical fish for sale online at Swell UKSnakeheads, striking oddball fish, great for species-only aquariums, tropical fish for sale online at Swell UK
Stingrays, great fish for large, specialist aquariums, shop tropical fish online at Swell UKStingrays, great fish for large, specialist aquariums, shop tropical fish online at Swell UK
Swordtails, colourful livebearers, cousins to platies, shop tropical fish online at Swell UKSwordtails, colourful livebearers, cousins to platies, shop tropical fish online at Swell UK
Tanganyikan Cichlids, african cichlids for hard water aquariums, shop tropical fish online at Swell UKTanganyikan Cichlids, african cichlids for hard water aquariums, shop tropical fish online at Swell UK
Tetras, lively, colourful fish, come in many varieties, buy tropical fish online at Swell UKTetras, lively, colourful fish, come in many varieties, buy tropical fish online at Swell UK
Tropheus, large cichlids for hard water aquariums, shop tropical fish online at Swell UKTropheus, large cichlids for hard water aquariums, shop tropical fish online at Swell UK
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Help and advice on shopping for: Tropical

What are tropical fish?

Typically, those fish found in tropical environments fall under the umbrella term of ‘tropical fish’. This includes many of the most iconic fish in the fishkeeping hobby, including Tetras, Angelfish, and Bettas, as well as some lesser-known varieties like Apistogrammas, Bichirs, and Killifish. There are 1000s of different types of tropical fish, split between freshwater and saltwater environments. That said, most fish sold in the fishkeeping hobby under the label ‘tropical fish’ are freshwater species.

Do tropical fish need a heater?

In most cases, yes. The vast majority of tropical fish come from tropical environments where water temperatures often exceed 20°C, sometimes 30°C! This means that they need to be kept in heated aquariums equipped with a quality aquarium heater. The best aquarium heaters are often adjustable, allowing you to pick from a range of temperatures and select the most suitable setting for your tropical fish.

aquarium heater in a fish tank

Before you purchase and set up an aquarium heater, it’s worth considering these two important questions. One, how big is your aquarium? A 100W heater will easily maintain tropical temperatures in a 100L fish tank, but it’ll struggle to do so in a 300L fish tank. As a rule of thumb 1W will reliably heat 1L of water, so a 300L fish tank should be equipped with a 300W heater.

And two, what kind of tropical fish are you planning on keeping? Some tropical fish, like Zebra Danios, like it on the cooler end of the tropical spectrum, around 18°C, while others, like Discus, thrive on the hotter end at temperatures of 30°C. Do a bit of research prior to purchasing your tropical fish and find their optimum range. Always try to keep tropical fish that like a similar temperature together, rather than mixing species with different requirements.

How do you set up a tropical fish tank?

The first, and arguably most important, step when setting up a tropical fish tank is purchasing the right fish tank for yours and your fish’s needs. When it comes to choosing a tropical fish tank, bigger is always better. As well as giving your tropical fish more space to swim, a larger aquarium will also make your water parameters (e.g. temperature, pH, nutrient levels) easier to maintain. This is especially important for delicate tropical fish that can’t handle dramatic swings in water parameters.

Once you have your tropical fish tank, add some kind of substrate layer – sand, gravel, or specialist aquarium soil work best – and then place your decorations. There’s a lot of variety when it comes to fish tank decorations; you can go for an artificial look and fill your tropical fish tank with pink gravel, sunken pirate ships, and plastic dinosaurs, or you can go for a natural look and create a wild-like environment with rocks, wood, and plants. As long as your tropical fish have places to hide, they’ll get on just fine.

Next, install a filtration system and an aquarium heater. There are lots of different types of aquarium filters to choose from: internal filters, external filters, sponge filters, hang-on-back filters (also known as HOB filters), and more. The type that’s best for you ultimately depends on the size of your fish tank and the type of tropical fish you plan on keeping. Typically, large fish tanks full of large, messy fish need large external filters, while small fish tanks housing just a few nano fish only need small internal filters.

aquarium filter in a fish tank

After that, it’s time to let your tropical fish tank cycle. This takes time, often several weeks, but it’s essential for creating a healthy, balanced aquatic environment that’s safe for tropical fish. There are several different ways to cycle your tropical fish tank, check out our help guide on the topic here for more information. To make sure your aquarium has fully cycled, either test your water with a reliable test kit, or take some of your water to a local aquatics store and have them check it for you. Once you’re given the ‘all clear’, add your tropical fish!

What tropical fish can live together?

As mentioned above, there are 1000s of different types of tropical fish. A lot of these varieties can live together, particularly small, peaceful fish like Tetras, Guppies, Corydoras, and Danios. You’ll often see these kinds of fish labelled as ‘community fish’ and this means that they can be added to tropical fish tanks containing other peaceful community fish. Some semi-aggressive fish, like Angelfish, Rams, and Discus, can also be kept in community-style aquariums, though this must be done with caution.

Not all tropical fish are suitable for community-style aquariums; some are best kept in species-only aquariums where they’re either kept alone (e.g. Male Bettas) or in large groups of their own kind (e.g. Peacock Cichlids) to reduce aggression. It’s a good idea to research the temperament of the tropical fish you’re planning on keeping before you purchase them. On all of our tropical fish listings, we include some information about their compatibility with other tropical fish.

community aquarium with different fish species

Why should I buy tropical fish online?

There are many different reasons why you should buy tropical fish online. Here are some of them:

  • Huge variety – we have close to 300 tropical fish for sale on our website, a lot more than we have available to purchase at our retail store in Hyde, Greater Manchester.
  • Convenient – with just a few clicks you can browse 100s of species of tropical fish, buy them, and have them arrive at your door in a matter of days.
  • Safe – we make sure that your tropical fish are shipped in the most suitable packaging for travelling and delivered to your door by the best and most reliable livestock couriers in the business.

What should I do if there’s something wrong with my order?

There are some risks involved with buying tropical fish online, most of which are outlined in our livestock declaration form at checkout. That said, we are aware that your fish may encounter some difficulties on their way to you. If you have any problems regarding your order, and/or concerns about the wellbeing of your fish on arrival, then please ring us straight away. We want you and your tropical fish to have the smoothest delivery experience possible.