Ph question

[hani]

Hi, i have pro3, is there a way to program it so that the co2 turn on/off at a set ph points during day hour, and off at night? i know i can use the noctornal change, but i would like it to drift down more than a one point, if it will stay off will be better? can program logic help?
thanks

[hani]

I think i did it with programable logic, i did set a timer with ph value using the AND comand, i will see what will hapen tom. hope it will work