Just be carefull not to bury the rhizome of the Anubias. The rhizome is the thick horizontal stem structure that all the leaves and roots grow from. If its buried for too long it will begin to rot.
One product you can use is called plant anchors. They are small pliable soft plastic disks with slits in the center. You push the base of the plant or the stems thru the slits. It is soft enough so it will not cut into the plant, (that is the danger of using anything metal) but snug enough to hold on.
I want those! There is also a plastic screen you can buy at any craft store. People use it to make tissue box covers and other strange crafty things like that sewing yarn into it. I just buy a sheet and cut slits in it and stick the plant stems through and bury the whole thing with substrate.
