Introducing new hissers to an existing colony

I'm planning to add more hissers from a different source to my current colony to improve the genetic diversity. Can I add them directly to the tank? Or do I need to keep them separate first and get them used to the smell of each other? I mean, will they attack other roaches they don't know?

 
If the males fight it wont matter how long they have to get used to each other first. Usually the fights are harmless.

 
For some reason, insects seem to only be alarmed while the injury is happening; once it stops they soon appear to calm down, even if half their body has been ripped off. The existence of insect consciousness is a controversial topic though.

fortunately, deantennated roaches can still taste for edibles with their palps, and I suspect that juveniles can regenerate antennae while molting

 
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