77K views · 1.8K reactions | If they live together, male betta fish will become aggressive and fight. This is how they earned their nickname, "fighting fish." The males will fight to the death if given the chance, so they should never be placed together in a tank. When a male betta fish is ready to breed, he will create a bubble nest. #betta #aquariumhobby #aquarium #fishkeeping | Hendrix backyard TV | Facebook