The bottle aquarium that I create is
It will be maintained for a long time of several years with No filter & No CO2.

I basically don't use soil.
I use silica sand (gravel) for bottom sand.

In a bottle aquarium
By the interaction of life communities
The bottom sand of silica sand grows on a rich plateau,
The environment changes to aquatic plants.

I build a "small ecosystem" of aquatic plants, fish, shrimp, snails, bacteria, etc. in a bottle.
It is the "small earth" in the room.

『SONO-method』
　▶ Nature-Bottle Aquarium
　▶ Balanced-Aquarium
　▶ Water plants Aquarium（Silica sand bottom）