* Goldfish Size: Comet goldfish can grow quite large, reaching up to 12 inches (30 cm). The size of the fish you get will determine how many you can comfortably keep.
* Tank Set-up: The size of your filter, the amount of live plants, and the frequency of water changes all impact how many fish you can keep.
* Individual Needs: Every fish has its own personality and space requirements. Some fish may tolerate being in a smaller space than others.
General Rule of Thumb:
* Overstocking is a common mistake.
* Smaller fish are more suitable for smaller tanks.
* Provide at least 10 liters of water per fish for healthy growth and minimal stress.
A Better Approach:
Instead of aiming for a specific number, focus on these factors:
* Start Small: Begin with 1-2 comet goldfish in a 120-liter tank. Observe their behavior and growth.
* Monitor Water Quality: Regularly check the water parameters (ammonia, nitrite, nitrate) to ensure they stay within safe levels.
* Add Fish Gradually: Only add more goldfish once the existing ones are well-established and the water quality is consistently good.
Remember: It's better to understock than overstock. Overstocking can lead to stress, disease, and even death for your goldfish.