If you just want to dissipate aggression, any fishes smaller then them can be used as dithers. I have used cardinals, different species of rasboras, endlers, nanostromus and even hatchet fishes.
However, i would strongly suggest that dithers be removed once you have free swimming fries. Or else, survival rate of your fries will be low. Also, i removed the male once the female spawns.
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