I'm getting 2 anubias barteri var. nana in this week that I am planning on planting rooted in the substrate for use as a midground in front of some stem plants. I have read that you're not supposed to plant it so that the rhizome is buried in the substrate because it will rot and the plant will die. This might be a stupid question, but do you just bury the smaller roots and leave the rhizome above the substrate?