another piece of flash equipement = another headache!!
don't worry to much about your PH, you are not a newbee to this hobby! do your corals look bad? have they stopped growing? do your fish look bad? do you see anything wrong in the tank?
if you answered all the above questions with no then remove your PH probe, put it in a box and chuck it under the tank (or sell it on trade me to some poor soul who up til now had a peaceful goodnight sleep). then go bed and sleep well without worrying about PH. dream instead about your new setup.