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Title: If You Care About Your Fish, Don't Buy This
Review: I had the same problem as a previous reviewer. After setting it, the light blinked, as promised, every 5 seconds, but after several hours, it simply shut down. I tried new batteries and resetting to no avail. I returned it and got an Eheim 3581 for the same price that works like a charm. Don't waste your time or money on this clunker.
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