If its just faded and darken abit don't worry. My red ornate did the same thing, they will change colour abit to blend in with there surroundings. The cocofibre is dark so he will darken abit. And with mine its just the red, the green is still very bright and vibrant. But just in case you may want to get your well water tested to make sure there isn't anything harmfull in it for your frog.