Autofeeder suggestions

[roblarss]

I am looking suggestions on an auto feeder. What do people have and which ones would you suggest.

Im looking for one that can sit on the top bracing and not clip onto the rim. I dont run a controller of any type. I mostly feed flakes. Tank is a medium stocked 140 gal.

I need to be able to leave for more than a day or 2 and want something that is reliable.

Thanks