Probably a good idea to keep the brewing too a maximum of 24 hours.
Another thing that can happen is adding too much sugars to the brew can cause the bacteria to multiply faster than what dissolved oxygen can being added to the water with the pump and air stones to support aerobic conditions. For the lack of dissolved oxygen to support the population the brew can go anaerobic. Water can only hold so much dissolved oxygen at a specific temperature and the higher the temperature the less oxygen water can hold.
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