Slight Issue

[saltynay]

One of my endler males has lost colour which hasn't returned for the last 3-4 weeks. Its the black marking just behind their gills and halfway up there body he used to have a really prominant perfect black circle however for the aforementioned time it has dulled/faded and isn't very vibrant apart from the change in coloration there are no other signs of anything untoward. The other male I have has very vibrant colouration and it seems to be isolated to only one of the pair. They are in with 3 guppy females who they are constantly trying to have their way with and both I believe are still doing the dirty deed and impregnating the females as far as I can tell.

 

[helterskelter]

could be old age, or ill heath.

Thats the only thing, if it's acting healthy and feeding normally then it's more to be old age.