Fish don’t live in a chemical-free spa. They live in a biological soup. That soup has minerals like calcium and magnesium. These keep their bodies working right.
Distilled water has zero buffer. That means pH can crash like a bad stock market. A sudden pH swing is a death sentence for your finned friends.
Imagine you’re a betta fish. You’re used to slightly hard water. Then someone dumps in distilled water. Your gills burn. Your slime coat fails. Not fun.
The Osmoregulation Nightmare
Here’s a quirky fact: fish are basically water balloons with fins. They’re constantly balancing water and salt inside their bodies. That’s osmoregulation.
Freshwater fish take in water through their skin. They pee a lot to get rid of extra water. Distilled water makes them work overtime. They bloat up like a sponge.
Saltwater fish? They’re the opposite. They drink seawater and pee out salt. Distilled water would actually shrink them. Talk about a bad hair day.
