My discuss aren't eat anymore?

Clownfish

New member
Hi, I have 2 discuss fishes (pretty big ones). They do eat regularly but one of them die so I put 5 more small discuss fishes into the tank (tank is also big enough for all of them) and none of them eat their food any more. But they seem happy and swim pretty well. What is happening with them and what should I do to make them eat?
 
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