No you don't need to use Excel with C02. A PH drop is normal when using C02 more so if you have a low KH. The drop you had is very minor and is still in good range, just keep a eye on it daily intill you get a balance in your C02. Also get a KH test, it should be no lower than 3. Your fish will be ok if the PH swings are not large ones. A after thought, I would test the PH at night when your lights are off to make sure it is not below 7.1 because the PH will be lower when the lights are off.
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