A classic amphora you can use as a little plant holder for the aquarium.
You just have to put some substrate in it.
I filled it with expanded caly, then I planted some Micranthemum.
*The expanded clay must be boiled before using it in the aquarium. If you do this, it won't float and it will be well sterilized (ready to be colonized by good bacteria).
Medium (Layer Height: 0,2mm)