Iridescent shark chasing behavior

[SaveThemAll1]

https://www.youtube.com/watch?v=TmhOvjxrYIA&feature=youtu.be&fbclid=IwAR352WOOP70BTPfgnNHzledBfvagWZh2iRouyfCYy qj6PDEfQrcAXjNeoPY

Hi, this behavior started this week , the big one is chasing the little one. they live together for almost a year and thats the first time thats happened. its happening a few times a day. Do you know what is this? Is it a game? attack? Mating behavior? thank you

[Slaphppy7]

My guess would be stress from living in such a small tank

See "In The Aquarium" in the link below

https://en.wikipedia.org/wiki/Iridescent_shark

[Rocksor]

It's telling the small fish to get out of its territory. With growth comes smaller territory.

[SaveThemAll1]

Is it dangerous? like ciclids ,can they hurt eachother?

[fissh]

Is it dangerous? like ciclids ,can they hurt eachother?

Yes they can thrash each other real well,