Bala Shark Not eating

Feb 4, 2006
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#1
I have 1 Bala Shark it is about 5 Inches long and he doesnt eat , he swims up and down the walls of the side of the tank all day and night and doesnt eat, atleast i dont see him eat...i feed my fish just regular fish flakes and all of the other fish eat except for him. Is there a reason he just swims up and down the walls all day and does not eat? Thanks