Whether its lovingly-kept garden ponds filled with Koi Carp to the humble goldfish bowl (although goldfish really need a proper tank to be happy and healthy) – Britain is a nation of fish lovers.
The Pet Food Manufacturers’ Association believe there are an amazing five million indoor fish tanks in Britain - that makes them the most popular animal in the country other than the ubiquitous to cats and dogs.
There’s plenty of choice when it comes to adding fish to (carefully set up) home aquariums, with pet shops offering a bewildering range of colourful and interesting finned friends.
Different breeds of fish have very different attributes - some easy to look after some difficult, some top feeders some bottom feeders, some lively and others happy to slink at the bottom of the tank.
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One of the most important things to note when choosing a new pet fish is whether they are likely to be aggressive - bullying, nipping or even eating their tankmates.
Many fish can co-exist happily with numerous other breeds in so-called community tanks, while others should be kept alone, with other fish of the same breed, or with breeds that are similarly aggressive.
Here are the 26 least, and most, aggressive breeds of popular tropical fish.
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5. Corydoras Catfish
Perfect to give you a helping hand with cleaning your aquarium, the Corydoras Catfish are bottom-dwelling fish that hoover up any leftover food. They prefer to be kept in groups of at least six and are extremely peaceful. Orinally from South America, they can defend themselves in a fight, thanks to their body armor topped by sharp spines. | Canva/Getty Images
6. Celestial Pearl Danio
Also known as the Galaxy Rasbora, whatever you call them the tiny Celestial Pearl Danio isn't going to hassle anybody else in its tank. They look like tiny trout and originally hail from Myanmar and Northern Thailand. | Canva/Getty Images
7. Swordtail
Swordtails are easy-going fish with an elongated tail resembling a sword - but it's never used for violence. Another fish that likes plenty of vegetation, the males are only occasionally territorial and otherwise this is a very friendly fish. | Canva/Getty Images
8. Rummy Nose Tetra
Pretty much all tetras get on well in a community tank and are likely to get on with pretty much anybody - other than the bucktooth tetra which is a bit of a scale-nibbling bully. Add a school of Rummy Nose Tetras though and you'll not have any complaints from the rest of your fishy community. | Canva/Getty Images