― We saw some bubble nest on top of our aquarium tank. But before that, about a month ago, my brother bought two fighting fishes also known as bettas. Its color is somewhat metallic blue, have long and thin body, and displays brilliant tails. He said that fighting fish cannot live together that’s why he put them in a small aquarium with a glass that separates the two. Since betta means warrior and displays aggressive protective behavior when combined with other fighting fish… But you know what [...].