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im new so take it as a grain of salt. but from what i have read that would be the time to start considering individual housing.
if they arnt fighting then i would guess its ok but i would still plan for another setup in the near near future.
Agression and/or stress is only one thing you have to worry about. They will start to breed much too young if you house them together. Females can lay eggs as young as 5 months and a male can certainly fertilize those eggs at 5 months.