1. Gather the necessary cleaning supplies: You will need a bucket, an algae scraper or sponge, a siphon, and clean water (preferably dechlorinated).

2. Unplug all electrical equipment: Before starting the cleaning process, turn off the filter, heater, air pump, and any other devices in your goldfish tank to prevent electrical accidents.

3. Remove any decorations: Carefully remove decorations such as plants, rocks, or ornaments from the tank so you can clean them separately.

4. Scrape off algae: Use an algae scraper or sponge to gently remove any algae buildup on the tank walls. Be cautious not to scratch the glass.

5. Clean decorations: While outside of the tank, clean any decorations with a soft brush and clean water. Do not use soap or chemicals as they can harm your goldfish.

6. Siphon the substrate: Use a gravel vacuum or siphon to clean any debris from the substrate (gravel or sand). Place one end of the siphon in the tank and suck on the other end to create suction. Make sure not to remove more than 25% of the tank’s water during this step.

7. Replace unhealthy water: Dump out any dirty water you removed from the tank into a separate bucket designated for waste.

8. Add new water: Gradually pour new, dechlorinated water into your goldfish tank. The new water should be around the same temperature as the old one to minimize stress on your fish.

9. Wipe down external surfaces: Use a damp cloth or paper towel to gently wipe down the outside glass and any external equipment.

10. Rinse out your filter media: Remove and rinse only with used tank water (not tap water) to preserve beneficial bacteria. However, if your filter media is beyond cleaning, replace it with new one.

11. Reinstall all equipment: Once cleaned, place your filter, heater, air pump, and any other equipment back into the tank. Ensure everything is in working order.

12. Place the decorations back inside: After cleaning, carefully put your decorations back into the tank.

13. Observe your goldfish: Watch for any signs of distress or difficulty adapting after reintroducing them to their clean environment. Consult a fish expert if you notice any problems.

14. Maintain a regular cleaning schedule: To keep your goldfish tank healthy, perform regular water changes and clean decorative items every two weeks. Also, monitor water quality by testing for ammonia, nitrite, and nitrate levels at least once a month.

By following these 14 steps, you can ensure your goldfish tank stays clean and healthy, providing an optimal environment for your aquatic pets to thrive!