I have a group of anthias that I am trying to move from observation to the main display. I was chasing them around a bit with a net and one just appeared to die. I didn't even touch this fish. Not sure how this is possible.
Wow sorry for your loss.
If a big unfamiliar scary thing comes right at you, there is a chance fish with a weaker heart can't take yet.
Kinda like those young athletes getting a heart attack while playing sports.