The Saturday school was opened at killifish's school
on June 24 in Japan.
 
Let's make the water tank.

The water tank of the circulation type that images the hometown mountain is made. ｡｡

A lot of riparian lives were able to catch. ｡｡

It is "Brook of spring" that flows in school of the killifish that exists in natural environment. ｡｡

Bacteria that clean water live in the water of "Brook of spring". Bacteria adhere to sand when the river sand is applied to this water. Sand that adheres bacteria is put in the bottom of the water tank. ｡｡

A small stone and the alga were put too. The fallen leaf of cherry blossoms was put. "Tannin "is included in deciduous leaves, and this tannin cleans the dirt of water. ｡｡

The living thing in water and the waterside was put, and the water tank was completed. ｡｡

Created by koumoto yoko

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