what is wrong with my biggest angel fish (size 3'')?

AVC the Great

New member
A month ago i added 10 angel fishes, size from 1'' to 3'' into my 60gal tank. the biggest one always followed my hand and fight over the food when i fed. but during the last 2 weeks it didnt eat anything. I noticed that it doesnt want to be socialized with other fishes any more. now it alone and not active any more. Although it isnt seem injured. and i havent seen other fishes attack it. Im afraid it is sick and will die of starvation.
Can someone please explain to me what is wrong with my biggest angel fish, he is my favorite fish in the tank. And what should i do?
Thanks for your time :=)
 
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