What it is
Aquarium simulator lets you keep a virtual fish tank while managing a real nitrogen cycle. You grow filter bacteria, test water parameters, feed fish, and perform water changes the way real fishkeepers do.
Editor takes
“The nitrogen-cycle numbers are a real spreadsheet treat, but the long-term loop depends on how patiently you can watch bacteria graphs climb.”
“There's a quiet, meditative story told through water tests and fish choices—less drama, more caretaking, and the tone is gently absorbing.”
“Each new tank is a fresh run with different stocking and bacteria timelines, though the loop stays the same test-feed-change repeat.”
“Netting fish and changing water feels deliberate, but with real-time speed options the true challenge is your patience, not your reflexes.”
How to play
Start a new tank and use the test kit to monitor ammonia, nitrite, and nitrate levels. Dose ammonia to grow the filter bacteria, then add fish, feed them, and do water changes when needed to keep the water healthy.
Tips
- Cycle the tank before adding fish so ammonia and nitrite have time to drop.
- Test the water regularly and watch the ammonia, nitrite, and nitrate readings.
- Do a water change, such as 30%, when water quality starts to decline.
- Feed your fish without overdoing it — excess food can harm water quality.
- Use the net when you need to move fish in or out of the tank.
Questions
Is this game free to play?
The simulator is playable in the browser at the Fish Tank Atlas site, and there is no mention of a price on the page.
Does the game run in real time?
It offers real-time progression as well as accelerated time speeds, such as one real minute equaling one in-game hour or one in-game day.
What is the nitrogen cycle in the game?
The game simulates the biological filter: bacteria grow and convert ammonia into nitrite and nitrate, and you track these levels with a test kit.
Can I lose fish?
Yes, fish can die if the tank is not cycled, if water quality degrades, or if they are not fed properly.
Is there a save system?
The Logbook and tank settings suggest you can manage and return to your aquarium, though the site text does not explain the specifics of saving.
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