I have a handful of Regal Demoiselle’s in QT with a firefish. In the past week or two we’ve noticed that one of them seems to be consistently white on a band around the fish just before the tail. The rest of the fish color is a little less black too. He hides a little more than the other fish but generally no other issues noted. He swims wicked fast so even a half-decent picture has been challenging but I finally captured the ones below. The fish do nip at each other a bit, however, there’s enough of them that no one fish gets picked on as far as I can tell and no damage noted on any fish. So is this just stress? All fish are eating and actively swimming. It’s just strange to me only one fish looks this way.
And a normal one that photo bombed:
And a normal one that photo bombed: