We were away for a long weekend (3.5 days) - when we came back the water was yellowish and smelling very bad, despite having a filter and aerator to have . Unfortunately, Mr. Fish did not live. We have previously used 3 day old feeders with no problems. It may have been his time, but I think the dirty water killed him. I would not recommend it in an aquarium smaller than 5 gallons.
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