I've had 3 Danios in my aquarium for a month. Two females and one male. They love to chase each other around, but mostly the male chasing the females. I then added 5 Glowlight tetra and for a while the chasing stopped and the Danios would even school with the tetras once in a while. The Danios have never chased the tetras so far, but this past week, the male Danio has taken to bowling through the tetras when they are schooling. So, he doesn't chase them, but waits til they are in a group then scatters them. He has also become more aggressive with the females and swimming circles around them. Kind of like he is herding them. He is also being very teritorial with a specific area around the driftwood. Aren't Danios supposed to be a bit more mellow? I feel like he is stressing all the other fish out. Will adding another 2 of them to make a bigger school, calm him down? I really don't want any more of them though.