Yes. If there is more than about an inch of gravel, you may want to remove some of it. Move the tank gently if it isn't completely empty, moving a tank with weight in it can stress the seams (I have never had an issue with this, but better safe than sorry).
How long has the current tank been up? If it has been up for a while, there tends to be a bunch of crud settled into the gravel and it may be a good opportunity to remove and rinse it. In that case, make sure NOT to clean the filter at the same time or you will remove too much of your beneficial bacteria and need to cycle the tank again. You can also take out a few handfuls of gravel prior to rinsing to preserve some bacteria in it.