Methods to observe the condition of Luohan fish:

1. Body posture: The posture of Luohan fish can reflect the condition of Luohan fish. For example, it is abnormal for a Luohan fish to be too fat or too thin. Observing the foreign objects appearing on the surface of the fish can also determine what kind of disease the Luohan fish is suffering from.

2. Body color: The darker or lighter body color of Luohan fish can reflect the changes in the status of Luohan fish. Even when Luohan fish is sick, color spots or zebra stripes will appear on the body surface. Therefore, when the Luohan fish is in bad condition, its body color will become very strange.

3. Head: If the Luohan fish often shrinks its head, it will also reflect its poor condition, and when the Luohan fish is sick, there may also be trauma or cell rash on the head.

4. Mental state: Observing the mental state of the Luohan fish can intuitively understand whether the Luohan fish is healthy. If the Luohan fish becomes no longer active, does not like to eat, or even rubs or bumps into the tank, time, it means that the Luohan fish may be sick and needs attention.

5. Excrement: The excrement of Luohan fish can also directly reflect the true state of Luohan fish. The normal excrement is black strips. If there is strange excrement, it means Luohan fish. The fish's body is not normal.