Sorry for my late reply on this.. Miss out the update and reply for awhile
Yes , i manage to program the Apex email alert to alert me whenever the PH get out of range . What i did is monitor the Apex PH chart for my CR under normal daily working operation to get the lowest and highest PH value, which helps determine the " Normal running condition" of my CR . This would allow me to set the Highest and Lowest PH range level to alert me if it go out of range. i.e; PH getting too low - which could mean overdose of C02 and could result of spike in parameter or PH getting too High - to a level that is consistent with the tank PH value which mean the C02 tank is empty that need refill and look into before KH start dropping.
Hopefully this will help me to achieve an overall more stable water parameter condition . I used to kept my tank KH at 11, as i am using timer to control the CR which precision control can be difficult , with this setting now i am aiming to bring down and maintain my KH level to 8 ~ 9 to see if there is any different to the corals.