The BEST! It’s amazing what is existing right under your feet. And using a strong magnifying glass or scope to watch what doesn’t appear to the naked eye.
I said. *naked*. >:P
We lived on an island with no electricity for 10 years; the boys did a similar thing with a seine/drag net at the shore. But having an aquarium was impossible without power.
Not so. I maintain several tanks in the Victorian tradition. One is a tank given to a 5yr old boy by his father in 1895. The boy gave it to me when he was 85. It contains plants and colorful shrimp with no electrical devices.