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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25. Oscar Fish
Another species of aggressive cichlid, the Oscar Fish is a natural born bully that will happily eat small fish by the shoalful. If you are going to keep other fish with them they need to be of a similar size and of an equally aggressive nature. | Canva/Getty Images
26. Tiger Barb
Individually small and relatively harmless, Tiger Barbs become highly aggressive in groups. They relentlessly nip fins of slower fish, causing injuries and stress. Their pack aggression makes them notorious bullies and feared by other fish. | Canva/Getty Image