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betta fish heater heat

  1. Help! My betta fish needs a heater.

    Betta Fish Bowls, Habitats, and Accessories
    I have a small fish tank and it is heated by a built-in lightbulb at the top. About 30 minutes ago, I turned it off because its nighttime. I checked on it like a minute ago it was still hot. But just in case, I wanted to make a heater, since its too late at night to go to the store and buy one...