Black Markings on my Red Texas' Fins

[Prowler]

Well, when I first got my red texas he had a little bit of black on his dorsal and tail fin, but recently it has gotten much worse where a good 60% of the fins are totally black instead of white/clear. Any idea what is causing this? I can take some pics if needed. Thanks.

 

[stotty]

Could do with the Pics.
What is your water quality like? You can get black scarring due to ammonia burns this is more common in gold fish.

 

[guppy]

I have not kept them but in another thread some some was saying it could be a seasonal sexual display. It is not flukes as they show up as individual small spots.

 

[Fried_fish]

Red texas will go through what they call molting. It get black spots and eventually most if not all of the black will dissappear.

 

[Prowler]

Thanks everyone for your help. Looks like a lot of the black is gone today.