
The pool was by the hill under some trees. The most surprising thing is that the pool is just around 8 inches by 8 inches, around 3 to 4 inches deep. There is just a little water inside. Stream water drips down through the hill. So the water is changed a little bit all the time.
There are about ten of them. Initially I thought they're amano, but a 100% reliable expert said they're absolutely not. Yes, they can't go out anywhere and they can't complete their lavare stage there.
It's a wonderful experience, but I'm still wondering where they come from and if the tiny pool will dry up one day. The pool is so small, the water just comes down drop by drop and again drains away drop by drop . The origin of them really puzzles me. They can't be something fallen from the sky.