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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9. Kuhli Loach
For something a bit unusual, add a few Kuhli Loach to your community tank. These peaceful, eel-like fish thrive in groups and enjoy burrowing in the substrate. They are nocturnal and prefer a well-planted tank with hiding spots. They are excellent at cleaning up leftover food but should be fed sinking pellets to ensure they receive adequate nutrition. | Canva/Getty Images
10. Bristlenose Pleco
Amazingly camoflagued - you could be forgiven for thinking they're a rock - Bristlenose Plecos are peaceful algae eaters that help maintain a clean tank. Unlike the Common Plecos, they stay relatively small, making them more suitable for home community aquariums. Pop a piece of driftwood in their tank so they can enjoy grazing on it. | Canva/Getty Images
11. Otocinclus Catfish
Otocinclus Catfish are small algae eaters that thrive in groups. They are highly peaceful and help control algae growth in a community tank. They require a well-established aquarium with plenty of biofilm and hiding spots. They do best with tetras, rasboras, and other non-aggressive fish. | Canva/Getty Images
12. Molly
Mollies are adaptable and peaceful little fish that come in a variety of colors - including orange and black. They’re livebearers so you may wake up to a few new fish in your tank. They are pretty unfussy about tank conditions and are reliable community fish. | Canva/Getty Images