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I have 5 cardinal tetras and I would like to get about 10 more and about the same amount of green neons will they school together? This is more just a curiousity than anything else.
I guess I should note that green neons (Paracheirodon simulans) are an entirely different species than what most folks think of as neons (Paracheirodon innesi).
I have not kept the green neon, but based on experience with lots of tetra species I would guess that cardinals would school better with other cardinals than with green neons.