Betta Is Chasing My Phantom Tetras?

[kieran1104]

Hey this is my first post for a while because all seemed to be going well, however i added some phantom tetra to my aquarium today and from time to time the betta fish will chase them for a few minutes. I originally put this down to the betta being slightly territorial and just investigating the others however now a couple hours later, it is still chasing them whenever them come close within the aquarium. Is this something to worry about?

 

[Randomitity]

Unless anyone is missing pieces of fins don't worry my bettas did this for a day before they stopped