Fish Tank is a live betting game by 155.io built around a real aquarium. A mechanical device drops coins one by one into a brightly lit fish tank, and you bet on where each coin lands — left, right, or into an object placed at the bottom like a treasure chest. It is streamed live, uses real physics instead of a random number generator, and is designed as a calm, visually satisfying alternative to the high-intensity games that dominate crypto casinos.
Quick facts
| Detail | Value |
|---|---|
| Developer | 155.io |
| Game type | Live physical coin drop |
| Outcome source | Real coin falling through real water |
| Round length | Seconds per drop |
| Bet types | Left / Right / Object |
| Design | Mobile-first, visually calming |
| Streaming | Live continuous feed |
| Auto-bet | Yes |
| Available via | Hub88 integration |
How Fish Tank works
A real, illuminated aquarium is filmed continuously. Above it, a mechanical arm drops coins one at a time into the water. As each coin sinks, it interacts with the water and any objects in the tank, drifting left, right, or landing on a specific target.
You place your bet before the coin drops:
- Left — The coin lands on the left side
- Right — The coin lands on the right side
- Object — The coin lands directly on or in a designated target (e.g., a treasure chest)
The object bet is the hardest to hit and pays the highest multiplier, similar to how exact bets work in Rush Hour.
The outcome is determined entirely by physics — the weight of the coin, water resistance, turbulence from previous drops, and the position of objects in the tank. No software decides where the coin lands.
Why Fish Tank is different
Fish Tank occupies a unique space in 155.io’s portfolio. While Rush Hour is fast and analytical and Ducks is chaotic and loud, Fish Tank is deliberately slow, calming, and meditative.
The aesthetic — soft lighting, shimmering water, ambient soundtrack — is closer to a relaxation app than a casino game. This is by design. 155.io’s CEO has said the inspiration came from fish-tank prize games going viral on TikTok, where the visual appeal was as important as the gameplay.
For players who find the intensity of Crash, Rush Hour, or live dealer games draining, Fish Tank offers a lower-stress alternative. The auto-bet feature allows you to watch the aquarium passively while the game runs, treating it as background entertainment that occasionally produces a win.
Strategy
Object bets are the high-risk play
Left/Right bets are roughly 50/50 propositions (adjusted for house edge). Object bets require the coin to land in a much smaller target area. The payout reflects this difficulty.
For sustained play, stick to Left/Right. For occasional excitement, add a small Object bet.
The pace is deceptive
Individual drops take seconds, and the continuous cycle means you can play dozens of rounds in a few minutes. With auto-bet enabled, the spending rate can accelerate quickly without the dramatic pauses that slower games provide.
Set a round limit or a loss limit before enabling auto-bet.
Fish Tank works best as a side game
The calm aesthetics and simple mechanics make Fish Tank ideal for running alongside other activities — watching a stream, browsing, or waiting between rounds of a slower game. It is not designed for deep strategic engagement.
Fish Tank vs other 155.io games
| Feature | Fish Tank | Rush Hour | Ducks.io |
|---|---|---|---|
| Pace | Very fast (seconds) | Fast (55 seconds) | Moderate (2 minutes) |
| Intensity | Low — calming | High — analytical | High — chaotic |
| Bet complexity | Very simple (3 options) | Moderate (4 bet types) | Simple (win/order) |
| Watchability | Medium — ambient | High — tension | Very high — drama |
| Best for | Background play, relaxation | Active betting sessions | Entertainment, streaming |
Where to play
Fish Tank is available through Hub88 integration on supported crypto casinos. As 155.io expands distribution, expect wider availability across major platforms throughout 2026.
See our full category guide: Real-World Betting Games Explained →
Frequently asked questions
What is Fish Tank by 155.io?
Fish Tank is a live betting game where a mechanical device drops coins into a real, illuminated aquarium. You bet on where each coin lands — left, right, or on a target object. It is streamed live and available on crypto casinos via Hub88 integration.
Is Fish Tank fair?
Fish Tank is fair — the outcome is determined by real physics, with a real coin falling through real water. There is no RNG or software deciding the result. All players watch the same live feed simultaneously.
Where can I play Fish Tank?
Fish Tank is available via Hub88 integration on supported platforms. Check your crypto casino’s game lobby for 155.io titles.
Who makes Fish Tank?
Fish Tank is developed by 155.io, the same studio behind Rush Hour (CCTV traffic betting), Ducks.io (rubber duck racing), Marbles, and StairPong.
Is Fish Tank better than Rush Hour?
They serve different purposes. Rush Hour is fast-paced and analytical; Fish Tank is calm and ambient. Neither is objectively better — it depends on what kind of experience you want.
