When purchasing, choose individuals with clean skin without visible damage, ulcers, or white film. A healthy fish should be active during twilight hours, and during the day, exhibit cautious behavior, often hiding in shelters. Avoid specimens with sunken bellies or signs of emaciation, as this may indicate internal parasites or problems adapting to food. In the store, it is recommended to pay attention to the following aspects: — absence of signs of aggression or damaged fins, which may indicate stress from being kept in an overcrowded aquarium; — normal condition of the eyes, which should be clear and free of cloudiness; — absence of rapid breathing, which is often a sign of poor water quality in the retail aquarium.