This device works great, but many reviewers misunderstand how it works. They expect it to slowly rotate as a clock does. The timer is INSIDE the machine, and suddenly, every 12 hours, it makes a rotation, thus dropping food into the tank. Many reviewers assumed their product was broken because they can't see it slowly turn. Two things to consider: it can be a challenge to attach to some aquariums, and if your feeder is very close to the water level, the food can clump from the moisture that evaporates or bubbles out.
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