Here's why:
* Waste Production: Goldfish produce a significant amount of waste, including ammonia and nitrates, which are toxic to fish.
* Overfeeding: Overfeeding leads to excess food decaying in the tank, which further contributes to water pollution.
* Limited Water Changes: Regular water changes are essential to remove waste and maintain water quality.
To keep goldfish healthy and their tank clean:
* Proper Tank Size: Choose a large enough tank for the number of goldfish you have. A good rule of thumb is 10 gallons of water per goldfish.
* Regular Water Changes: Perform partial water changes weekly, replacing 25-50% of the water.
* Filtration System: Install a powerful filter that can handle the bioload of your goldfish.
* Proper Diet: Feed a balanced diet of high-quality goldfish flakes or pellets.
* Tank Maintenance: Regularly clean the tank gravel and decorations.
By following these guidelines, you can prevent your goldfish tank from becoming dirty and keep your goldfish healthy and happy.