7.5 is in an acceptable range. Though not optimal, the fish will adapt to it and be quite healthy and happy. If you are concerned and check the ph of your water supply. If it is lower than 7.5(ish) it is probaly something in your tank such as a rock or decoration that is causing it. As for vinigar, I don't recommend it or playing with buffers. All you will get is unstable ph that will swing wildly and stress the fish far more than a constant ph level even though high.
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