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It is not unusual that a male will harass/kill a lone female. Malawi are harem breeders and ideally you would have many females (for example 4 or more) for every male. Buy more demasoni to breed them.
 

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They are hard to sex at any age.

What we usually do is buy 2X as many unsexed juveniles and then rehome any males that cause trouble as they mature. That does not work well if they are expensive.

Demasoni aggression can be managed with large groups of 12 or more individuals after removing troublesome males. Even if you get this one female to spawn, the average number of eggs is 9.

I would probably buy 6 unsexed juveniles but if you want to try spawning the lone female perhaps you could put her with the male for brief and closely supervised periods.
 
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