As hundreds workers foraged on the table and some did fall on the ground I wanted to confine them to their formicarium so when alone at home I stopped the heating , opened the windows so the temperature dropped to 14 or 15°c then the number of workers outside diminished by two thirds but many did still forage or rest outside their main nest. So at the end I closed the formicarium and collected hundreds of ants left outside with the mouth aspirator . I did also separate the small colony , under siege for months now , who still have hundredths of workers. I removed the old connection and connected it to a small acrylic tank to have the colony recover ( if the queen is still alive).
The invasion by the big colony did no look like killing many ants of the small colony at first , there were even few combats but slowly piles of dead accumulate . Most of the brood was stolen, the rest died because the defenders in the small "ant farm" were not able to bring in enough food. It looked like a slave raid followed by a long siege.
Now the large colony eat again 6 Tenebrion (meal worms) pupae or white larvae (having just shade their skin) per day.
They have also in permanence a piece of apple and de-husked sun flower seeds. The colony is really big (more than 15000 workers) and I am already planing for a nest extension .
Wile removing the old nest number of Tetramorium climbed on my hands and I can assure that the biggest workers can bite strongly and sometime even pierce the skin with their stinger.
Despite their weak stinger and venom these ants are very strong fighters because of their aggressivity, strong bite, body armour and large number who maintain some cohesion .