
- BGG rating
- 7.0
Aquarium Expansion
- 2–6 players
- 30 min
- 2011

2011
Rules assistance for Aquarium
Plain-language explanations of turns, card effects and disputed situations, with official source references and saved question history.

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Answers come from the official rulebook, with the page to check.
Aquarium is a board game released in 2011 for 2–6 players, 45 minutes per game, and ages 8 and up. It was designed by Sander Vernyns and Tim De Rycke and its main mechanics are Set Collection and Simultaneous Action Selection.
Aquarium offers high player interaction as the other players can – and will – use their action cards to alter the available fish that you can buy and the price that you have to pay for them. Each player starts with a set of nine action cards and $15. The deck is shuffled, then set up with three or four "Feeding time!" cards shuffled into the deck at various points. On a turn, a player first turns up a card from the deck if the market is empty (as it is as the start of the game). Then the player looks at the fish and plant cards in the market and decides whether to pass or try to buy them. If he passes, he takes $2 from the bank and adds the top card to the market; if he wants to buy, all other players get to influence what's on the market and what the cards cost. First, each other player chooses one of their five action cards for use in phase 1 of a buy. These cards force the active player to add, remove or swap a card from the market or simply allow the card player to make a fish swap of his own! (Players can also pass, with all action cards but the "pass" being set aside.) Second, each other player chooses one of their five action cards for use in phase 2 of a buy. These cards add or subtract 1 from the cost of the market, or double or halve the cost of the market. In the latter case, the player of the card receives money from the active player instead of those coins going to the bank. Once the goods and the cost are set, the active player chooses to buy all the fish and plants on offer or none of them. The cost is equal to the sum of the card values, plus or minus any modifications, then doubled or halved as appropriate. All purchased cards go into a player's personal aquarium. If a player has two identical fish, he can move them to a separate breeding tank where they will earn him 1-3 coins each turn. Each time a "Feeding time!" card is revealed, players reveal one "food cost" card at random, then pay money equal to that cost times the number of stars on fish and plants in their aquariums. Any fish not fed starve and float away to the big toilet bowl in the sky. Each plant in an aquarium reduces the food cost by one. After the final "Feeding time!", players count the stars on their non-breeding fish, then receive bonuses for collecting all colored fish of the same size, all three sizes of fish of the same color and different varieties of plants. The player with the most stars wins. Here, fishy, fishy, fishy...
Aquarium supports 2–6 players according to the catalogue. This range comes from the publisher’s listed player count, so the game can be set up for any group size within it. Some setups, rules and scoring details may still vary by player count, so check your edition’s rulebook for the exact configuration.
The listed playing time for Aquarium is 45 minutes. This is the publisher’s estimate for a full game. The actual duration depends on the group, the player count and familiarity with the rules: first sessions usually run longer, while experienced groups often finish faster. Setup and teaching time are not included in this estimate.
The catalogue lists Aquarium for ages 8 and up. This is the publisher’s recommendation and reflects reading demands, rule complexity and small components rather than theme alone. Younger players can often join with help from an adult, so check the age guidance on your edition and consider your group’s experience with board games.
Aquarium has a complexity rating of 1.9 out of 5 from BoardGameGeek players, which makes it a light game. The rating reflects how much rules knowledge, planning and decision-making a typical game demands. Expect a longer first teach for heavier games, and use a preparation guide before game night.
Aquarium belongs to these categories: Card Game. Its main mechanics are Set Collection and Simultaneous Action Selection. Categories describe the theme and setting of a game, while mechanics describe what players actually do on their turns. Each mechanic links to a catalogue hub with similar games, which helps when you want something comparable.
The credited designers of Aquarium are: Sander Vernyns and Tim De Rycke. These credits come from the published game data and name the people responsible for the game’s design, not its illustrators or publishers. Designer pages on MeepleRules collect other titles by the same designers, which helps when you enjoy a game and want to find similar ones.
The catalogue lists Aquarium as a base game. It can be played on its own with the components in the box and does not require any other title. Expansions, if any exist, add new content or rules on top of it and are listed separately in the catalogue with a link back to this base game.