Hey guys, I just wanted to find out what you guys think. My red pigeon blood discus has gone though quite a huge change in appearance since i first got it. This is how it looked when i first got it around February 2015 It now looks like this, the colours are darker with peppering and black tail fin and edging From what I have read it could be caused by either stress or their environment. I don't think they are stressed as they are eating and appear healthy. It could be the black background causing it to darken to blend with the environment? I have changed to a white background to see if its colours lighten up at all and i have a pool filter sand substrate which is light in colour. So far no change. Could it be due to breeding? as it has been spawning with another discus in my tank. Has anyone else experienced anything like this? Is it just a lower quality discus? Or could there be something else wrong? I don't ever test my water parameters besides pH, but my fish are healthy overall.