| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple aquarium obtained by using a transparent container with a cap, represented by a PET bottle, especially the structurally simple aquarium effective as the utilization of a waste material for a large PET bottle, and further to provide a connectable simple aquarium by utilizing the simple aquarium. SOLUTION: A small pump 21 is loaded inside a cap body 2 which has a female screw 22 capable of being screwed to a pouring opening 11 of a main body 1 of a container, and a filter part 3 is connected to a sucking port 21a of the small pump 21. A water-supplying hose 5 with a proper length is connected to a discharging port 21b. At least the filter part 3 connected to the sucking port 21a is formed into a state of inserting the filter part 3 so as to stop in the water in the main body 1 of the container. A male screw 22 of the cap body 2 is screwed in the pouring opening 11 of the main body 1 of the container. The cap body 2 installed in the small pump 21 is integrated to the main body 1 of the container, and the water in the main body 1 of the container is circulated from the tip side of a water-supplying hose 5 into the main body 1 of the container.
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