Are you saying that for the size of the fish or because a pair might not work in that tank, I did think about a Cuban cichlid pair
Some fish like Oscar's both get to 12in in length so a bit of a tight fight, hard to make a place for her to fit in that he can't. Others like Carpintis have a 12in male but a 8 to 10in female. You can make her a hide he can't get into.
Also the breed of fish will play a role. Some can breed at a younger, smaller size. Others like the Oscar can't breed till a certain age, and in some after they have reached full size.











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