Yeah I don't think flakes are suited to auto feeders. Do you use an air pump to keep the feed dry?http://www.ebay.com.au/itm/99-Days-...852850?hash=item464581eab2:g:5BYAAOSwxN5WXqfG
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I've been using this one for around 4 years, whenever I am away.
It is cheap, works better than the ones with a vertically oriented container and rarely clogs with pellets. It does clog rather quick with flakes though.