Sudden death

[Ariel110G]

So Sunday morning I have notices that my flame angel is missing, for most of the day I was going crazy looking for him, I had him for over a year!!! I hate losing a fish especially when it?s a fish that is over all doing grate in the tank and healthy. So bottom line is at night when one of my anemones closes up for the night he was found dead. The spot he was in was covered by the anemone.This fish did not show any sings for sickness, very active eating, over all was doing great, and all my fish are overall healthy, and I have some difficult fish in my tank, like a copperband, and 2 mandarin fish, and more, all healthy.
Any Ideas what have could cause him to die?

 

[KathyC]

Sorry for your loss.
There are times we will never know why a fish died when there were no previous warning signs. It could have been organ failure or another internal problem.

Best to keep a close eye on all of the others for the next couple of weeks for anything unusual you might notice. If all is good (hope so!), there isn't really anything you can do