Does anyone know what this is. The spot has developed recently. The fish has been not as colorful for awhile now, but eating.
https://photos.google.com/u/1/photo/AF1QipNyXwbxvvFntCHfNmjuG71nG0DUinJ4t1usE94x
https://photos.google.com/u/1/photo/AF1QipNyXwbxvvFntCHfNmjuG71nG0DUinJ4t1usE94x