It differs from aquarium to aquarium but it is generally just about seven and can go to about eight. It should never be below seven because that is too acidic for fish. Different fish prefer different pH. Some fish will like it around seven, others around eight and some in the middle of the two.
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The ideal pH level for maintaining a healthy aquarium water pH is typically between 6.5 and 7.5. This range is suitable for most freshwater fish and plants to thrive in a stable environment.
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To adjust the pH level of your aquarium water to make it more acidic, you can add substances like peat moss, driftwood, or commercial pH-lowering products. These can help lower the pH and create a more acidic environment for your fish. It's important to monitor the pH levels regularly to ensure they stay within the appropriate range for your aquarium inhabitants.
It is important for a fish aquarium owner to purchase a ph probe for their tank. It helps measure the pH levels in the water. Certain types of fish will only survive in water with a certain pH level and one would need to know what their tank pH level is for their fish to survive.
A good buffer recipe for maintaining pH levels in an aquarium is a mixture of baking soda and water. This can help stabilize the pH levels and keep them within the ideal range for fish and other aquatic life.
Normal pH level is around 5.5-6.5,anything higher than 7 can b deadly to ur aquarium,fish stores usually sell a few different products to reduce or increase ur pH value such as PH MINUS.
The pH for a aquarium is 5-7
pH 9-10
Most likely you have high Nitrates, which will lower your pH, or you just changed water, and used water that you don't usually use, or you added something that changed it.
To neutralize acidic aquarium water and create a suitable environment for fish, you can add a pH buffer or use crushed coral or limestone as a substrate. Regular water testing and monitoring can help maintain a stable pH level for your fish.