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Small Rooms: Gumball Machine FishTank:::Remove the top of the gumball machine and twist off the glass globe. Remove the mechanical parts inside the machine. Apply plumber’s caulk around the bottom of a round glass bowl that holds at least 1-gallon of water Press the caulk against the metal base. Fill bowl with a single layer of round, glass beads. Choose brightly colored beads that look like gumballs. Fill the bowl with water and add a goldfish or betta fish into the tank.