Drag the glowing crack up or down the right glass panel (below the waterline), then press Breach. Torricelli outflow, buoyancy, drag and current act differently on rocks, fish, plants, glass and the floating toy.
🪨 rocks sink🦆 toy floats🌿 plants bend🐟 fish fight current💧 jet weakens as level → crack
Drag directly on the yellow crack handle on the right side of the tank, or use the slider. Fish near the breach first swim left against the current — weaker fish tire and are swept out. Small objects that fit the opening can escape; large rocks cannot. Press R to reset, B to breach.