Hey there.
I have a few Tapinoma sessile (or at least that's how we've identified them) queens; from the papers I've read, sometimes they are polygynous, sometimes they are monogynous. To me, this suggests a species complex, but regardless. Would it be 'safe' for me to introduce a new queen into the claustral tube of another queen in this case? Is there a best practice for how to do it?