![]() ![]() On the other hand I've seen apistos go after everything that moved when they breed. I've kept cardinals on and off since 1968 and I've only ever seen them become aggressive in very small groups when something had happened, and for a short while your group might be down to just a handful. their social behavior with one another can get very rough, especially during breeding. I'd also call them skittish fish, because they're the first to hide when I stick my hands in the tank.īut man. They have never bothered the other fish in my tank, and they're actually rather meek around them. I don't want to indicate to anybody that I think these fish are semi-aggressive because my diamonds are truly 'peaceful' and non-combative with every fish that isn't their own species. I definitely agree there's some variation between species. My biggest males sit at around two-and-a-half inches. I have only Diamond Tetras and they grow to be on the larger side for tetras. I guess there might be some species-dependent minimum number required for non-aggressive behavior, even in the presence of a larger fish. The green neons, on the other hand, vigorously chase each other all the time. The lonely diamond-head acts just like a cardinal. The cardinals ignore every other fish including themselves, they don't school and don't pick on any tankmates. I have ten cardinals, one diamond-head neon and six green neon tetras in a tank with one balloon pearl gourami (he is a gentle tank boss).
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