I have two Cardinals. After the lights go out, they tend to swim together a bit more than usual. As they swim around, they will both puff up their throats (one more than the other).
I have had a female do the same so I think it's not a clear sign of the banger being gay
If thier hanging out together and there not killing each other your onto a good thing really. Mine took nearly two months before thier first spawning event.
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