- Only stock your goldfish pond with the appropriate number of fish. Too many goldfish create a drain on the pond's resources. The oxygen levels decrease while the ammonia and nitrate levels increase. Allow between 3 and 4 square feet of surface area for each goldfish you place in the pond. For example, a 5-by-8-foot pond has a surface area of 40 square feet, assuming that it is a perfect rectangle. This means that 10 goldfish can live in the pond, though fewer will be healthier.
Keep Water Quality HIgh
- The ideal pH range for a goldfish pond is between 7.0 and 7.8. Test the water regularly and adjust it slowly if it becomes too high. Do not spray herbicides or pesticides near the pond so that your goldfish do not become poisoned. Test the nitrate levels in the pond; ideally it should be zero. If you have a nitrate problem, there are likely too many fish in the pond or your filter is malfunctioning.
- Feed your goldfish with food pellets on a daily basis. Only provide the goldfish with as much food as they can eat within five minutes. Too much food causes the goldfish to sicken, and leftover food sinks to the bottom of the pond to rot and putrefy. Discourage anyone from dropping food into the goldfish pond because it may affect the water quality.
- Goldfish are vulnerable to a wide variety of predators, including herons, cats and raccoons. These animals fish in the water, so give your goldfish places to hide from their predators. Leafy plants provide the goldfish with the cover they need while rocks give the goldfish protected places that the predators cannot access.