"Problem is we won't be able to show it to anybody."
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Doc's fish tank was a small glass aquarium owned by Dr. Emmett Brown


In 1931, Emmett used it to grow bacteria, which were used in the creation of fuel for his rocket-powered drill.

By 1986, it was still in Doc's garage, albeit now with a red teapot as decoration.

In 1986B, First Citizen Brown kept the tank in his office, where Marty McFly pointed it out to try and convince Citizen Brown that he had been present in 1931 when Doc was making fuel for the drill.