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Originally Posted by MyraVan
There are quite a few algae eaters you can get that stay small. For really small tanks there's shrimp and snails (nerite snails are by far the best snails for eating algae). For 10g and up, there's otocinclus catfish, which top out at 1". For 30g and up, there are a few plecos that get to a max of 5" or so, like the rubbernose pleco or bristlenose. I've got a bristlenose (we call him Sebo, which is the make of our vacuum cleaner) and he's doing a great job in the 58g.
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Yes, all of these that I mentioned are very peaceful and would be fine with your guppies. Just choose the right one for your size of tank. I should have mentioned that otos are schooling fish and thus you must have at least three of them; six are better. The algae eating shrimps also do best in larger groups, so I have read (they look best in groups, so I always buy at least 5 of them).