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P.H. swings

I am just about to add fish to my 75 gallon tank and I want to know about 
p.h. swings. I inject co2 to my tank and have it set to shut down when the 
lights go off. I mantain a p.h. of 6.8 and have no trouble doing so, but 
during the night the p.h. creeps up to about 7.0 or 7.1, is this ok for the 
fish or will it stress them? I plan on getting Apistogrammas (cacatuoides) 
any comments will be helpful. Thank