What's wrong with this elegance coral?

[reefwars]

I've seen it countless times, there is no cure and no way to stop it once it does.

In the 90's elegance were the easiest and most sought after corals, ecs (believed to be caused by human chemicals) has wiped their reputation and numbers to the point of small quotas and a place on endangered lists.

In the wild ecs is non existent