When I introduced a new male I picked one half her size, then acclimated and put him in the tank inside a clear plastic "critter keeper." She had time to show me her intentions toward him, and after a couple hours with no visible aggression, I released him.
She showed him who was boss for a few minutes, he did the shakey-shakey, and things calmed down that same night.
They were both false percs.
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Alan
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