What Is Normal Betta Fish Behavior Is This Normal Betta Behavior?

Is this normal betta behavior? - what is normal betta fish behavior

I have my betta a week ago and I have a tank with 5 gallons an artificial plant, a soft, lightweight, and a shell. they eat, but has recently been floating around and shake very fast. that nothing in his tank zoom all day. Is this normal? is just boring? Fish get bored? What are some ways to occupy?

Also, they often go to the water surface to breathe. is that because of the labyrinth organ in bettas?

Thank you!