If tap water is not good for a goldfish what type of is?

Goldfish are freshwater fish, so they need water that is low in minerals and impurities. Tap water can contain high levels of these substances, which can harm goldfish. The best water for goldfish is distilled water, which is pure water that has been removed of all minerals and impurities. If distilled water is not available, you can use dechlorinated tap water. To dechlorinate tap water, you can either boil it for 10 minutes or add a water conditioner to it.

Here are some tips for providing goldfish with good quality water:

- Use a filter to remove impurities from the water.

- Change the water regularly (at least once a week for a small tank, and more often for a larger tank).

- Test the water regularly to make sure the pH and hardness are within the ideal range for goldfish.

- Add plants to the tank to help oxygenate the water and provide hiding places for the goldfish.

- Do not overcrowd the tank. Too many goldfish in a small space can lead to poor water quality and health problems for the fish.