No pH really isn't an issue except under rare circumstances (If you have fry or are breeding it can be a real issue.) Most fish can handle a very wide range of pH (5.0 - 9.5, some even wider like 4.5-10.5.) Ask your local water department what your pH and water hardness is (kh) in case people ask.
However, you do need to measure ammonia, nitrites and nitrates.
The first 2 should be zero and should be measured whenever the fish are acting strange and whenever the tank is new.
The second should not be zero, but should not go higher than 40-50, but preferably should be kept under 20. Ideal is below 10, but most people never have ideal and still have a fine tank. Measure that before a water change. If it keeps getting too high, do more frequent or larger water changes.