java fern and anubias should not be planted into the sand. let the rhizome out, best just superglue it or try to wedge it between rocks or driftwood. if the rhizome is buried in sand the plant would die.
hornwort just let it float around, good for taking out ammonia with fast growing.
anacharis can be planted but can live floating around as well. it develops some roots, fast growing, needs trimming.
you can plant amazon sword into sand, add some root tabs for it.