Alien Containment (Subnautica)

The Large Aquarium is a large, circular aquarium currently only available in experimental mode which can be filled with Fauna caught by the player. It is built using the Habitat Builder inside rooms.

In order to get inside of or put fish into the Large Aquarium, the player must build a Hatch on the side. If two or more Multipurpose Rooms are stacked on top of each other, building Large Aquariums inside each Room will cause the Aquariums to merge in one bigger tank. The player can then enter the Large Aquarium and release caught fish into it. Non-edible fish can currently only be added by using console commands.

If you leave two creatures of the same species inside the Large Aquarium for long enough, they will breed and another fish of the same species will spawn inside. Eggs can also be placed inside the Large Aquarium. Once the Large Aquarium reaches a population of 10 fish, the reproductive process will stop.