1. Long erythema: There may be obvious erythema or rash on fish, which may be caused by virus or bacterial infection.

2, rotten skin: the fish's body may have skin ulcers or erosion, which is usually due to poor water quality or infection with viruses or bacteria.

3, dyspnea: If the hexagonal dinosaur fish is infected with viruses or bacteria, it may lead to dyspnea, manifested as shortness of breath or difficulty.

4. purple lips: if the fish's lips are purple, it may indicate that the fish has been seriously deprived of oxygen or infected with viruses or bacteria.

5, muscle relaxation: if the fish's muscles are relaxed, this may be due to infection with viruses or bacteria, resulting in damage to the fish's immune system, resulting in the above symptoms.