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Umm id say so. Not sure about the smaller tetras like the rummy nose. I keep my gold Severum with black widow tetras, rainbows, silver dollars, Congo tetras, clown loaches and Synodontis.
The fish mixture would be fin in terms of aggression. The smaller fish like the rummy nose and rasboras you might find being picked off one by one, But that's only when the severum gets big enough to eat them.