The Buenos Aires tetra is a peaceful fish, as with the other tetras. Personally, I like a corydora... of any variety. They are very good bottom feeders. Keep in mind that just because you have a bottom feeder, doesn't mean you don't have to do your routine maintenance on the tank (gravel cleanings, water changes, and filter cartrige replacements).
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Phishie
Site Coordinator

"An ounce of prevention is worth a pound of cure."