Here’s a wild fact: Bottled water can have a pH of 6.0 or 8.5. That’s a huge difference. Most fish need a pH between 6.5 and 7.5.
Your tap water is often “buffered.” That means it resists sudden changes. Bottled water is not. It can swing wildly.
One minute, your tank is a cozy home. The next, it’s a chemical rollercoaster. Wheee! (Your fish is not enjoying the ride.)
What About “Aquarium-Safe” Bottled Water?
Some companies sell water specifically for fish tanks. It’s a real thing. They literally add the right minerals back in.
This is the bottled water most likely to work. But it’s expensive. And frankly, a bit silly.
You can make your own perfect water for pennies. Just use a dechlorinator on tap water. Boom. Done.
