The Aquarians.
The aquarium can be filled with fresh water by adding salts available from specialty stores. But this is not the best solution: seawater contains a large amount of microorganisms, plants and animals, very precious. Thanks to these aquariums are self-sufficient for our entire school year. For the same reason when we go to sea to supply the aquarium, we also collect some rocks and seaweed on top with a handful of sand and rubble areas near reefs.