Reliable Source: Buy discus from a reputable and trusted source. Look for reputable breeders or reputable aquarium stores known for healthy and well-cared for fish. This helps minimize the risk of acquiring sick or stressed discus. Health and Appearance: Carefully examine discus for signs of good health. Look for bright, clear eyes; vibrant and undamaged fins; smooth and flawless skin; and active swimming. Avoid fish that appear lethargic, have torn or discolored fins, are panting or breathing rapidly, or show signs of visible parasites or disease. Size and Shape: Choose discus with a rounded and symmetrical body shape. Avoid specimens that appear thin, emaciated, or have an asymmetrical body structure. Healthy young discus should exhibit a plump appearance and a proportionate body size. Coloration: While young discus may not exhibit the full coloration of adults, look for fish with distinct and well-defined patterns. Colors should be vibrant and evenly distributed. Avoid discus with bright or faded colors, uneven color distribution, or excessive stress stripes (horizontal stripes). Behavior: Observe the behavior of discus. Healthy discus should swim actively and confidently. Look for fish that are curious, interact with their surroundings, and show interest in food. Avoid fish that are shy, constantly hide, or exhibit abnormal behavior such as excessive aggression or excessive shyness. Feeding Response: Young discus should have a healthy appetite and eat readily. If possible, ask the seller to feed the fish while observing their response to feeding. Avoid discus that show no interest in food or show difficulty eating. Water Conditions: Inquire about the water parameters in which the discus was raised. Discus fish are sensitive to water quality, so it's crucial to choose fish raised in appropriate conditions. Ensure your aquarium's water parameters are similar to those your discus fish are accustomed to to minimize stress during acclimation. Quarantine: It's always recommended to quarantine new discus fish before introducing them to your main aquarium. This helps prevent the spread of potential diseases to the existing fish population. Quarantine also allows you to closely monitor new fish for any signs of illness and provide appropriate treatment if necessary. By considering these factors and being patient during the selection process, you can increase your chances of bringing healthy and thriving young discus fish into your aquarium. Be sure to provide them with appropriate conditions, proper nutrition, and regular care to ensure their long-term well-being.