I've had male smaragdina that grew up together get along very well until the day that they don't, when all hell breaks loose. This was in a 10g grow out tank; perhaps in a roomier tank with broken lines of sight they'd be more tolerant of each other.
One of my "female" Macropodus ocellatus is now tending a nest full of fry! Sexing them is very tricky when they're young. The male is very tolerant of the female, & even lets her help round up stray fry. The little ones should become free swimming tomorrow, when I'll remove the parents & begin feeding smelly infusoria.
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