Submersible aquarium water pump

How to lower fish tank pH
Are your pH levels too high inside your tank? If so, you have come to the right place to find solution! 
There are many factors you need to consider when taking care of your fish tank, but the most important is to keep the parameters inside the tank stable, such as pH. To keep your fish happy and healthy, you must maintain pH levels by monitoring and testing the water quality frequently.
What Is The “Ideal” pH For Freshwater Tank?
pH ranges from 0 to 14. If the pH of water is less than seven, it is acidic, and if it is 7.0, it is considered neutral. Water with a pH higher than 7.0 is considered alkaline.
The beginner's question is what the pH of the water should be when raising fish. It's not that simple, it depends on the right ph for each fish. In general, our freshwater fish prefer water with a pH between 5.5 and 7.5.
How to Test pH in Tanks
The pH of is an important parameter, so don't change it without special need. If you need to lower the pH of the tank at this point, then you need to test it first.
Weekly testing is necessary, but if there is a problem, you can also test it daily.
pH test strips are a simple and inexpensive way, but their results are crudely inaccurate. I suggest you better invest in a monitor that displays a constant pH reader.
Normally, the pH of fresh water should be between 6.8 and 7.8. For saltwater, the pH should be between 8 and 8.4. However, the ideal pH range is also relevant to your fish.
Methods of Lowering pH in Tank
Now that you know the pH of the tank, I will teach you how to change the pH.
Driftwood
While Driftwood acts as an ornamental element, it also releases a substance called tannin that lowers the pH in the water. All trees and plants, as well as extended driftwood, contain compounds called tannins or polyphenols. Although driftwood can give your tank a yellow color, it can also be one of the ways you can consider, after all, simple and inexpensive.
Peat Moss
Peat moss is another option that