It is better in many cases to focus on the the size of the difference and the precision of that value quantified as a confidence interval.“Statistically significant” is not the same as “scientifically important”.
Note that the 5% probability is for the family of comparisons, not just for one comparison. If all the data in all groups were really sampled from the same population, then there is a 5% (if you pick the traditional value for alpha) that any one (or more) of the comparisons would be designated as statistically significant. With all the methods except Fisher's LSD, these decisions correct for multiple comparisons. If you correct for multiple comparisons using statistical hypothesis testing, one of the main results will be a decision for each comparison as to whether it is statistically significant or not.
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