What is the reason for the new fish entering the tank and closing its mouth and gills

　　What is the reason for the new fish entering the tank and closing its mouth and gills
I love fish farming. The previous fish are good. The short-butterfly butterfly carp that I just bought recently didnt like to move the tank or open my mouth. I didnt move the gills much. Whats the problem?Pray for help from Anning District, Lanzhou City, Gansu Province
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