We bought these when we were away for about a week. We have 3 aquariums and we bought one for each. They are easy to set up and program. It takes a bit of trial and error to figure out the right portion size, but it wasn't that hard. They are securely attached to the edge of the aquarium. Aquarium. I've tried attaching them to the lid with double sided tape and threading them through the hole in the lid, but that didn't work. I wasn't sure if the tape would hold and not all of the food went through the feeding hole in the lid. So I attached it to the aquarium instead. This meant the lid from the feeder was partially open so I added towels to cover the holes so the fish wouldn't jump out. I installed the feeders about a day before the trip so I could keep an eye on them and they worked. OK. The next morning after we got home I checked the tank to make sure the feeders were still working. I programmed the feeder at the goldfish tank for 8:30 am. At 8:25 a.m. the goldfish began circling under the feeder and at 8:30 a.m. it dropped the food. So yes I would say they did a great job while we were away.
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