Just From observing when i moved my 1"-2 " discus from a Sand bottom tank to a BB to help they grow and be healthier & make it easier on me with the water change tank their color faded away i know its not from being sick or anything like that maybe stress or not i am really not sure. my question will they color come back over time or it just the way discus are and their environment and surrounding play a big part in thier color.