Can You Use Bottled Water For Goldfish. You should treat it with a water conditioner before adding it to your tank as it may still contain chlorine which is harmful to goldfish. You would need to test and adjust it before using it in your tank.

You should treat it with a water conditioner before adding it to your tank as it may still contain chlorine which is harmful to goldfish. For example, some bottled water still needs chlorine removed. If you are using water from natural sources, there’s nothing wrong if you are using bottled water.