Discus turned half white?!?!

[freddielang]

So my discus is half white and half blue. It is a dark angel and I’ve only had him for about a month. I’ve never seen anything like this before but I’m sure someone has. As soon as he sees me his color comes back. Hes never been much of an eater and it’s hard to get him to do so, still in quarantine but I’m guessing it isn’t going to end well. Picture attatched