Camden,
Im really sorry you're going through this. I know that it is tough. Potentially having sick fish is never fun - especially when you have no answers. I have absolutely zero qualifications in diagnosing fish diseases. However, if getting a good quality video is tough, try to carefully examine the fishes. Do they have white bumps? Sometimes these white bumps that come with things like velvet can be hard to see, especially on colorful fish like Anthias. Do they swim in front of power heads? Are they "itching"?
Sounds like they may be doing better now as of your most recent post. However, still carefully observe them to make sure that there are no signs of disease starting.
The heavy breathing could have been from the sporadic darting around and not necessarily a sign of disease.
Good luck!