Fish Tank — Play Free at Rune Riches

Released in 2025, 155.io's Fish Tank pairs the kind of mood you settle into for a longer session with the kind of polish you expect from a studio at the top of its game.

Under the hood, Fish Tank runs at 90.09% return-to-player, slightly tighter than average but offset by feature frequency. The pacing comes from medium volatility (—/10) — a balanced rhythm of frequent hits and occasional spikes. Across — paylines the line-win structure stays easy to track..

155.io have built a reputation for consistent feature pacing, and Fish Tank sits comfortably in that lineage. Mobile and desktop versions feel effectively identical — touch targets are sized for thumbs, animations remain smooth on mid-range hardware, and the audio mix scales down gracefully without headphones.

Roll Fish Tank at Rune Riches for free — claim your welcome bonus, hit the reels and see how it feels.