Yes,you may. Actually it depends on personal preference and limitations.
Personally, I find that for planted tanks longer then 2ft, 2ft is a good height. Any taller it becomes difficult to maintain (i.e. ability to reach most parts of the tanks with a tweezer while trying to view from the front). Adding a few inches to accomodate substrate is an option.
Don't forget that if you want to clean the glass, you'll need to be able to reach the back lower corner of the two sides with your hand (an algae scrapper can reach furthur but I find them awkward to use).
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