Think might have better chance if both go into new environment.
In the past i ever tried to put 2 together successfully ( gender unknown, had to put as no enough space )
What i did was, i put the aro in existing tank into bag, i changed 50% water and reintroduced both fishes back into the tank at the same time. They did fight abit, take nips at each other's tails. But eventually i was lucky they managed to sort of co-exist.
This kind of thing best to be closely monitored as if they fight, could be deadly.
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