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Behind Glass: Aquarium Simulator
Create stunning virtual aquariums on your PC! Our advanced 3D engine brings your fish tank to life with breathtaking realism, featuring lifelike fish, plants, decorations, and more. Transform your monitor into a vibrant, living aquarium. Virtual aquascaping has never been easier!
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via SteamSpy as of 2026-05-19.
“LOVE IT so realistic and so cool but it gets boring after i while”
— a player, Steam review · 6 hrs played“The best aquarium simulator I have played to date! If you are big on the intricacies of this sort of thing this is the one for you! Lots of details to enjoy, I am not even close to getting through all of them yet. Another perk is devs are very responsive to community feedback…”
— a player, Steam review · 5 hrs played“This is an unusual aquarium sim in that fish behavior is realistic. Catfish rest on the bottom, clownfish seek anemones to hide in, Big fish bully and chase little fish. The jellyfish DLC is quite lovely. One minus: filters and heaters and so forth do not actually appear…”
— a player, Steam review · 23 hrs playedPlayer activity
Monthly average concurrent players. Live count fetched 2026-08-02 19:18 UTC · history via SteamCharts.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
New Fish Species & Decoration Pack DLC
Here's another update with new content and improvements! This time, we've added plenty of new inhabitants and a decorations DLC for your aquariums: 10 New Fish Species : Black Neon Tetra, Butterfly Ba
Meet 20 New Species
It’s been some time since the last content update — and now your aquariums are getting a major expansion! This update introduces 20 brand-new fish species , including standout additions such as the vi
Meet the New Species
This update introduces 11 new fish species , including highlights such as the Hawaiian Cleaner Wrasse , Spanish Hogfish , Midas Cichlid , and Three-Spined Stickleback . Alongside the new additions, th
20 New Fish Species + Recolor Your Gravel
It’s time for another update packed with fresh content and enhancements. Here’s what’s new in your aquariums: 20 New Fish Species 🐟 Black Surgeonfish Chinese High-Fin Banded Shark Cuckoo Wrasse Flagta
New Fish, Jellyfish, Round Aquariums
We’ve just released another update with new content and improvements -- here’s what’s new in your tanks: 10 New Fish Species: Bengal Loach, Blue Botia, Candy Basslet, Crimson Loach, Diadem Dottyback,
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-19.
| Genres | Casual, Indie, Simulation |
| Player tags | Underwater · Realistic · Life Sim · Relaxing · 3D · Farming Sim · Nature · Idler · Clicker · Education · Submarine · Building (SteamSpy community voting) |
| Features | Single-player · Steam Achievements · Steam Workshop · Steam Cloud · Family Sharing |
| Languages | English, German, French, Italian, Spanish - Spain, Japanese, Portuguese - Portugal, Russian, Turkish, Portuguese - Brazil, Spanish - Latin America, Korean, Simplified Chinese, Traditional Chinese |
| Achievements | 11 |
| Estimated owners | 0 – 20,000 (SteamSpy) |
Minimum system requirements (PC)
Minimum: OS: Windows 10 Processor: Dual core Memory: 4 GB RAM Graphics: Nvidia GeForce GTX 970 / AMD RX480 DirectX: Version 11 Storage: 2 GB available space