Hi,
I use the following auto feeders on my tanks
http://www.drsfostersmith.com/produc...&N=2004+112973
Works well, has the individual compartments for flake or pellet, has an airline hookup. Its big though, and hangs over the tank on brackets. Drops the food over a 2 hour period of time, encourages fish to stay in the open.
http://www.drsfostersmith.com/produc...&N=2004+112973
Works well also, no airline hookup, holds more food than the feeder above, much smaller as well. Drops all the food at once, what I use on my cichlid and community tanks - encourages a mass feeding frenzy.
-Mike