the chromie was there from the beginning so 7-8 years I have had him. The tang probably 6 yearsHow old were the fish that died? Chromis typically don't live past 5 if I recall correctly.
Sorry to throw another wrench in the proverbial mix, but idk. Could be Old age. Clowns can live easily past 10 years. Don't know about tangs and eels.
I agree could have been old age. But one clown was in the same condition laying on its side not moving. He just made it threw the night and is ok this morning