07-02-2011, 11:13 AM
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Any of the Corydoras would be good in a 55G. You should have enough room on the bottom of the tank for the 5 minimum for the corys. They hit 4" maximum depending on the species.
For profiles look on the blue bar near top of the page and see tropical fish profiles. There is a section of "Catfish" look around it has the tank size requirements, along with diet and other behaviors you need to know about.
Another thought is to go to the catfish specific forum and look around for posts when you see a interesting thread look around. I know Bryon talked about a Farrowolla (spelling) catfish and I looked it up curious about it.