Very interesting.... Sometimes there are some unique and interesting corals out there. I have seen some bali colts that are so dark they look purple.
It kind of throws you off a little from the average colt, etc.
You never know....you might have come across a new coral for all we know.
I came across 2 new corals about 3 years ago that I have never seen anywhere else or i've ever seen since then. (They were out of Phillipines, I guess the phillipines has recently started exporting coral, etc.). One was a leather that formed a shelf with yellow polyps all over it, the other were pink neptheas, and lemnalia.
The lemnalia's seem to be more common now.
I've heard of some wholesalers selling dyed corals. They usually tell the vendors and retail stores if they are dyed.
I've always stayed away from dyed corals. They never seem to live very long, maybe a few months up to 6.
I think what you might have had was a Bali colt coral. And for some reason or another something got to him or he didn't like something thus resulting in death.
Rob