02-05-2012, 07:20 PM
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Discus should not be maintained with angelfish due to the temperature variation (assuming commercially-raised angels here) and the angelfish's more aggressive feeding which can cause the discus to not eat and literally waste away.
Mikrogeophagus ramirezi will work with discus. For other fish with either or both, check the profile, it mentions several that are suitable.
By the way, I've moved this thread into cichlids; assuming it got in catfish by oversight (the categories are close to each other in the list, easy to do