Yes, a high pH can kill fish. The ideal pH range for most freshwater fish is between 6.5 and 7.5. When the pH level rises above 8.5, it can become stressful for fish, and at a pH of 10 or higher, it can be fatal.
How does a high pH kill fish?
A high pH can damage the fish's gills, making it difficult for them to breathe. It can also cause the fish's body to produce too much mucus, which can clog their gills and make it even harder to breathe. In addition, a high pH can interfere with the fish's metabolism and cause them to become lethargic and stop eating.
Symptoms of a high pH in fish
Some of the symptoms of a high pH in fish include:
- Rapid breathing
- Gasping at the surface of the water
- Lethargy
- Loss of appetite
- Skin and gill damage
- Increased mucus production
- Death
What to do if the pH in your aquarium is too high
If the pH in your aquarium is too high, there are a few things you can do to lower it:
- Add driftwood or peat moss to the aquarium. Driftwood and peat moss release tannins, which help to lower pH.
- Add a pH buffer to the aquarium. A pH buffer will help to stabilize the pH level and prevent it from fluctuating.
- Use reverse osmosis water for water changes. Reverse osmosis water has a pH of around 7.0, which is ideal for most freshwater fish.
- Avoid using medications or water conditioners that can raise the pH level.
By following these tips, you can help to keep the pH in your aquarium at a healthy level and prevent your fish from getting sick.