1. Prepare a separate tank: Set up a separate, clean tank with a gentle filtration system for your goldfish fry. This will ensure a safe environment free from the aggressive behaviors of adult goldfish.

2. Maintain optimal water conditions: Keep the water temperature in the tank between 68-72 degrees Fahrenheit (20-22 degrees Celsius). Ensure proper pH levels by maintaining a range of 7.0-7.4.

3. Create a suitable habitat: Add smooth-surfaced decorations such as aquatic plants and sandbox-size gravel to provide the fry with hiding places and prevent injuries.

4. Feed the right food: Newly hatched goldfish fry should be fed nutritious, easy-to-digest foods like infusoria or liquid fry food. As they grow, increase their diet to include brine shrimp or daphnia.

5. Feed in small portions multiple times daily: Feed the goldfish fry small amounts 3-4 times per day to ensure optimum growth and health without polluting the water with excess food particles.

6. Perform regular water changes: Replace around 20% of the tank water weekly in order to maintain ideal water conditions for your growing goldfish fry.

7. Monitor growth and adjust space accordingly: As goldfish fry grow, they will require more space for swimming and exploration. Adjust tank size accordingly to accommodate their needs, averaging one inch per gallon rule.

8. Keep a close eye on their health: Observe your goldfish fry regularly for signs of illnesses such as loss of appetite, lethargy, or abnormal swimming behavior.

9. Cull sick or deformed fish: It is essential to remove unhealthy fish from the tank to prevent the spread of disease and allow healthier ones to thrive without competition for resources.

10. Maintain proper filtration: A cycled filter is essential in maintaining optimum water conditions for developing goldfish fry, ensuring they remain healthy as they grow.

11. Introduce compatible tank mates: As the goldfish fry grow, introduce compatible species that will coexist peacefully in the same environment without posing a threat to their growth and health.

12. Gradually acclimate them to your main tank: Once the goldfish fry have grown strong and large enough, gradually introduce them to your main tank’s water conditions over a week to avoid causing stress or illness.

13. Continue regular care: As your goldfish fry mature into juveniles and adults, continue providing proper care in terms of water quality, nutrition, space, and compatible tank mates to ensure their long-term health and happiness.