This is closely related to the way the light is introduced.
Also, the temperature range that the creatures can survive varies depending on the creatures that you put inside.
Temperature control is particularly difficult in winter and summer.
Here, we will first consider how to prevent the temperature from dropping too low in winter, and then how to prevent it from rising too high in the more troublesome summer.
First of all, if you do not know the temperature inside the Mini-Earth, you will have to rely on intuition to control the temperature, which will make it even more difficult.
Here, we recommend attaching a small thermometer with a suction cup for aquariums to the inside of the container.
Next, how much temperature the creatures inside can live on.
Basically, it is safe to assume that animals and plants that are native to Japan and can survive the winter can survive the cold of winter.
However, if ice forms inside the Mini-Earth, it is really dangerous.
They will still be alive, but it is at the limit and they will hardly move.
It is thought that a temperature of around 10 to 28 degrees Celsius is a comfortable one for many animals and plants.
Even though they are native to Japan, river water is still cold even in summer.
There are shrimps that live in harsh environments such as irrigation channels in rice fields, but even these creatures are in danger when the temperature reaches 30℃.
It is important to note that many of the plants and animals that can be purchased at aquariums are from the tropics.
When it comes to tropical plants, there is an incredible variety, so you have to look into each one individually.
So, how can you keep your Mini-Earth above 10℃ in winter?
The easiest way is to leave it in a north-facing window with a weak air conditioner on.
It is essential to say that many of the plants and animals that can be purchased at aquariums are from the tropics.
For example, guppies are said to become sick when the temperature drops to around 20℃, but they are not particularly resistant to high temperatures, so it is said that it is best to keep them at a maximum of 28℃. The temperature range that it can adapt to is much narrower than that of killifish.
When it comes to tropical plants, there is an incredible variety, so you have to check each one individually.
So, how can you keep your Mini-Earth at 10°C or higher in winter?
The easiest way is to leave it in a north-facing window and keep turning down the air conditioner.
If the electricity bill is unacceptable, you have to get it accustomed at room temperature.
Even without air conditioning, it will not freeze unless something extraordinary happens, but that is quite a limiting environment for a mini earth.
Also, you may think that it is okay to place it in a south-facing window in winter and expose it to direct sunlight, but I do not agree with this.
Convergence fires can occur even in winter, and the temperature of the Mini-Earth will rise quickly on days when it is exposed to direct sunlight.
This will increase the temperature difference between day and night, and it is likely to be very stressful for the creatures inside.
Now, let's finally discuss the most troublesome measure to deal with high summer temperatures.
In fact, there are two definitive "solutions" to this.
The first solution is to expose it to light while exposing it to the air for 24 hours to cool it.
This will require a lot of air conditioning, so you need to think whether this is acceptable in terms of electricity costs.
The other solution is to put water in an outdoor clothing case or similar and submerge the mini-earth in it.
The water in the clothing case evaporates rapidly, so unless something extraordinary happens, the temperature will not reach 30°C.
If the water in the clothing case decreases, you can just add more water, and if the temperature rises, you can also replace the water.
In summary, using air conditioning is easy to manage, but it costs electricity.
It can be said that the method to save on electricity costs is quite time-consuming.
I have tried both, and I would encourage you to try both.
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