Are serpae the same size as buenos and diamond? The serpae i have with angles never nip them.Deep-bodied (round) tetras like Buenos Aires, Colombian, Diamond, Congo (though not continent-correct, if that matters).
Then you have the potential issue of larger tetras nipping the fin extensions off the winemilleri’s dorsal and anal fins. I had long-fin serpae tetras and Hy511/candycane tetras with my sveni and the sveni never grew trailers.
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What I was trying to ask is if you know of a larger tetra that actively school like rummynose. rummy are constantly swimming where as cardinals just sit there and look pretty.