No other fish show symptoms. My Breidohri caught this a week or two after a Zonatus in the tank kinda took over the tank. Zonatus started chasing fish around more, doing what cichlids do when they realize nobody can stop them. I never saw any fights with the Breidohri, no fin damage or bite marks on scales, but still--I think the whole episode raised stress levels for all fish in the tank.
I saw a post of another Breidohri that died of this recently. Maybe Breidohri are one of the susceptible species.
My Breidohri caught, and recovered from, Hex 2-3 months ago, too. Perhaps he was just more disease prone.
Shame to lose him, though. He was around 10 inches, had him about a year. It takes a long time to grow a fish to that size and condition. I'm gonna order a couple more Breidohri because I really like them alot, but it's like starting all over.