Which water is best for fish tank?
Deionized (DI) Water
If you want to be sure your aquarium water is free from mineral and chemical contaminants, deionized water is a great choice. Deionization is ineffective against bacteria, but it does filter some contaminants that even reverse osmosis systems cannot catch.
Is spring water or distilled water better for fish tank?
Don’t put spring water in fish tank if it’s polluted or doesn’t contain the required minerals and nutrients. Besides spring water, you can use tap water, distilled water, rainwater, and bottled water in fish tank. Spring water is considered better for fish tanks than purified water.
Can I use bottled water for my fish tank?
Bottled Water Is Freshwater
Moreover, it has been treated with chlorine or chloramine to remove dangerous bacteria and other pathogens. Based on this, once you treat bottled water with an aquarium conditioner, it should be fine to use in a freshwater tank.