Hi all, I've had my Oscar for about a year, he is in a 67 gallon tank by himself. He was around 3-4 inches when I got him, now he is over 8 inches. My issue is that a couple of days ago he started refusing food, the same cichlid pellets I've been feeding him all his life and that he usually gobbles up with relish. Now he will take one in his mouth, spit it out, then swim away uninterested. He is still eating blood worms (I guess some things are hard to say no to). I know that Oscars are prone to "sulking" and that refusing food is one such way that they do this, but I'm getting a bit worried as he has not eaten a single pellet in 5-6 days now. Anything I can do?