Make the water level rise to the top of the big fish tank.
You have 15 minutes to gather six things, then you must put all six things in the big fish tank. You may not put anything in the big fish tank before 15 minutes are up, and if any water leaves the big fish tank at any point you are disqualified, but it has to be six things, no less. Closest water level to the top of the big fish tank wins. No fish tanks may leave this room. Your time starts now.
Series 13 / Episode 5