My PH has gradually risen to 10.00 in a Cichlid tank. I use baking soda to increase the PH. Is it the cause of the rise due to an increased amount of undissolved carbonate salt ( I think that is the correct mineral) ? I am tring to get the ph to stablize at 9.2 to 9.4 . I have removed the stones that fizzed when using Muratic acid test. The substrate is a combination of Cichlid mix and Flamingo sand. They are only supposed to have a PH of 8.2 to 8.4 . Is there somthing I can add to keep the PH from rising , that is not sold as a hobby product ?