When introducing the important thing to keep in mind is to introduce a male that is similar in size as your females, if he is much smaller he will be bullied.
You can introduce any male based on that simple concept, you still need to remember that it can get a little rough even when rotating animals that know each other and have been together previously there will be some roughness, there is just a line between rough and dangerous to the point where the animal is in danger.
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