Nanofish Aquarium for Etching

In many places on the internet I found that so-called "Nanofish aquarium." For the production I decided mainly from practical reasons, I will have a dedicated container for etching, which is also effective. Why the name Nanofish Aquarium? On the Internet I didn't found useful information, I assume, however, that because the fish Nano (Nano Fish) which is small and would be so small aquarium already sufficient.

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