I purchased one of these from Charterhouse Aquatics in August 2010.
Figure 1 – Eheim 3581 Automatic feeding unit
I’d been looking for one of these for while as I dislike the holiday feeding blocks that you can buy in various pet stores. I want to be able to feed my fish when and how I please. This particular model allows you to programme in four feeding times, and the amount you want to feed them at each of those times.
It also features a safety system that detects a low battery and wont allow the feed to take place until the batteries are replaced. This prevents the system from stopping in the ‘down’ position and emptying its contents into the tank.
The feeding window is adjustable with a sliding piece of plastic. It takes trial and error to know exactly when the window is the right size for your tank feeding requirements.
I have placed it directly on the condensation tray of my tank, but it is supplied with clips and other fastenings for your particular feeding hatch.
Read more about it here: saltaquarium.about.com
See a video of it in action below:
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