Jam Jar Fish Tank, more commonly known as the aquarium, is an underwater building that can be constructed on the Home Island. Players can deposit fish and monsters that they have collected into the aquarium, which then generates passive income. The larger the fish and monsters in the aquarium, the more income that is generated. Players can visit their aquarium and watch the fish and monsters swimming around in the individual tanks for each destination.
There is an upper limit to the amount of coins generated by the aquarium based on the number and size of the fish and monsters that it contains. Thus, it is recommended to collect the income from the aquarium at least twice a day to ensure that no income is lost.
When the player has a fish in their bag that hasn't been added to the aquarium yet, there will be a red notification above the aquarium indicating that this fish can be added. However, the aquarium currently does not indicate to the player if they have a larger fish in their bag that can replace a smaller fish in the aquarium, so it is recommended that players keep checking if they can add larger fish to the aquarium to maximize their gains.
Although it is a heavily requested feature, there do not appear to be any plans to add an aquarium for creatures[1].
Requirements: Character level 4
Construction costs:
Level 1 (Paradise Island): 25 and 3000
Level 2 (Great Lakes): 10 and 1000
Level 3 (Costa Rica): 15 and 1500
Level 5 (Australia): 25 and 2500
Level 6 (Scotland): 30 and 3000