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co2 and aeration

I have a 100 gallon gal plant tank that I have been running for
several weeks. I use most of the Dupla method and their equipment and
supplements. I presently use a Neptune controller for the co2. I have
one problem my ph has been dropping to 6.50 during the night and
slowly rises to 6.80 after the metal halides come on. The set point
for the co2 is on at 6.80 and off at 6.75 1 have been considering
adding another timer to turn a air pump on when the ph drops to 6.60
and to turn off when the ph rises to 6.70. I believe that the aeration
will only be on when the lights are off during the period that the
plants also use oxygen. please let me know if this is a good idea.