Can you use bottled spring water for freshwater fish?

It is generally not recommended to use bottled spring water for freshwater fish as the mineral composition may not be suitable for their needs. Most bottled spring waters have a low mineral content which is not ideal for freshwater fish as they thrive in water with a specific pH and hardness level.

Additionally, some spring water contain high levels of certain minerals like sodium, magnesium, or calcium which can disrupt the delicate balance of freshwater ecosystems. If using bottled water is necessary, it's crucial to ensure the water is labeled as safe for aquarium use or to dilute it appropriately with RO (reverse osmosis) or distilled water to ensure it closely matches the preferred parameters for the specific fish species you intend to keep.