Originally Posted by Angel_fish
To raise ph add some baking soda 6 is very low. Add small doses until the ph is at 7 start at just 1/4 cup let sit for about an hour do a test. If its at 7 your good if still below 7 add more baking soda
We do not know the cause of the ph drop. Adding chemicals should always be the last resort for a tank situation. 1/4 cup of baking soda is ALOT of baking soda. Simply increasing the wcs is a simple and natural approach to addressing an issue with ph drop. If the Op continues to have issues with the ph dropping, a natural approach would be to use aragonite or crushed coral in his or her filter to stabilize the ph and increase the kh
in the tap's range without raising it.