All Anubias variety is don’t require dirt or sand to grow
The plant just need to be attached to a piece of driftwood or a rock with a twist tie, fishing line, or nylon string
Also when you plant them, make sure that the rhizomes are about an inch apart
That way they will slowly grow together overtime without overtaking each other
The roots systems of these plants are so versatile that they will wrap around and grow into whatever you tie them on to
Once the roots have developed a decent network you can remove the string holding them on; they will hold on their own