I currently have coarse gravel covering the bottom of my planted tank. I kinda feel like my plants will plateau due to this substrate choice (I had the substrate before I became interested in live plants). I never felt like making the total revamp to a new substrate. I'm even thinking of possibly getting a new substrate to layer under the gravel. I'm looking for your opinions, preferably from experience, about what substrate you would choose for a lush tank and why.