Don´t over water the plant. The Fiddle leaf fig does well with short dry periods between waterings. The frequency of watering depends on the amount of light the plant gets. One good way to determine how often you should water is to let the pot dry out until the new growth at the top begins to wilt slightly. Calculate the time that elapsed from the last watering and subtract a day or two to determine the ideal frequency of watering. This way you will be watering the plant just before it starts to wilt the next time.