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My name is ***** ***** I have been a Vet Tech for 30+ years and a fish keeper for over 40+ years.
There are several natural ways to reduce ph. The one way I love is using a Piece of Driftwood in the tank. It looks nice as well as well as will lower the Ph and keep it balanced. Another way is to set up a second filter with a Peat Moss bag, instead of a charcoal filter. This too works well naturally to lower and balance the PH in a fish tank. You can read more about the natural ways here: http://homeaquaria.com/4-simple-ways-to-lower-aquarium-ph-naturally/
The chemicals when used to lower the PH can throw off the whole tank so in my opinion, it is better to do it naturally.