I built the impossible tank - a beach lagoon complete with rocky and sandy shore, waves, changing tides, tidepools, mangroves, and more. It's part of a complex project to create the ultimate lagoon ecosystem vivarium, which will house brackish-loving animals like mudskippers, crabs, and bamboo sharks. This sit the moment I realized that we had created a real beach in my home. In the end, I reveal which creature will be the first to be introduced to the lagoon.