Melchior wrote:Thanks for your reply!
Flagellates & infections. True, that could be possible.
But I treated the fish against flagellates & bacterial infections (because it was my guess as well). But that didn't have any effect.
Possibly because you didn't remove the stress factor present in the tank, in this case remove some males.
And with flagellates & bacterial infections, I would have expected the males to die around the same time (like in a couple of days).
No, as the males did not neccesarily get stressed at the same time, they will not die at the same time. As I said above it's not something present in the water.
And also, I suppose stressed males won't show their color so easily.
Yes, they do, actually it's one of the warnings signs. To have several full colored C. macrops males in the same tank, is a major stress factor and a call for trouble. They will display and defend their territories, showing their best colors (you could call it a way too long adrenaline kick), until they are so exhausted their immune system gets down. Any behaviour out of the ordinary is stressful, including constant displaying
All the best, Thomas