I have a 75 gallon tank with gravel on the bottom topped by sand. The only time the gravel ever comes to the surface is when I uproot large plants. This works if you are smart about your planting. You can help by just cutting the roots after you pull some of the base of it out. I have had this set up for over eight months and I just have a few spots that are exposed from heavy replanting. It isn't anything that you couldn't just dump more sand on top of.
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