Zebra Danio Behavior

Hi all! So I have been out of town for a while and have only been to the house a few times during between trips. I’ve noticed my fish swimming and circling each other a lot. Specifically these two. I can’t tell if they are trying to breed or something or they are stressed. There are only 5 of them now because one died a few months ago. But that never seemed to bother them. My friend (who has been watching them) has noticed this behavior too and took a video a while ago. I’ll put screenshots of it below. And please excuse the dirty tank. I hadn’t had a chance to clean it out before leaving and my friend wouldn’t do it for me. I got home last night and will be able to clean it hopefully today or at latest tomorrow. I will be getting the water tested too since I haven’t done that in a few weeks either. My question:

Is this behavior normal? Breeding? Stress? What is this?

Also the screenshots are blurry because they are moving very very fast in circles with each other.

They look like they could be a pair spawning? If they are they’ll probably do it early in the morning, especially if there’s direct sunlight on the tank. They do this a few times, scattering a few eggs each time.

Post a vid of the behavior