Otocinclus and Bristlenose plecos. Cories don't eat algae. You don't necessarily NEED an algae eater. If you have algae now, you should try to fix what's causing it and not count on the fish. But, if you just like bottom feeders, small plecos like Bristlenose and Rubbernose would be fine, as well as Cories.
Bearded Cories don't look too much like Plecos, IMO. Here is a link with pics:
http://www.scotcat.com/factsheets/sc...x_barbatus.htm. According to that link they aren't classified as Cories anymore, but they still look like them.
You'll want to get atleast 6 of those guys.