One of the discus not eating

[JQW]

Hey guys,

I've got 6 young torquoise discus in my 4ft tank.
Only fish in there are the discus.

5 out of the 6 are very healthy and eating well.
But the smallest one isn't eating anything.

He's still swim over with everyone else during feeding time but not touching the food. He's been like that for 2 weeks now.

Ammo. nitrite 0
Nitrate havn't test, but I do 15% water change 3 times weekly.

Feed sera discus granular and frozen community dinner.

What should I do?


Regards

[FishLover]

try some frozen bloodworms, that may get him start eating