* Lack of Minerals: Distilled water has had all minerals removed, including essential ones like calcium, magnesium, and trace elements. Bettas need these minerals for their bone health, immune system, and overall well-being.
* Osmotic Imbalance: Betta fish are freshwater fish, meaning their bodies are adapted to live in water with a certain mineral content. Distilled water is too pure, causing a significant osmotic imbalance. This can lead to:
* Swelling: As water rushes into their bodies to compensate for the lack of minerals.
* Electrolyte Imbalances: This can disrupt their vital bodily functions.
* pH Issues: Distilled water has a neutral pH (7), while bettas prefer slightly acidic water (around 6.5-7.5). The lack of buffers in distilled water makes it difficult to maintain a stable pH, which is crucial for fish health.
What to Do Instead:
* Use Dechlorinated Tap Water: The best option is to use dechlorinated tap water, which is safe for bettas once the chlorine is removed.
* Add Water Conditioner: Use a water conditioner specifically designed for aquariums to remove chlorine, chloramines, and heavy metals.
* Use Bottled Spring Water: You can also use bottled spring water that is specifically designed for aquarium use (check the label).
Always test your water parameters regularly to ensure they are within the safe range for bettas.