I dont know about those ants you have but here we have a quite tiny 'Sugar Ant' their called and every now and again they seem to become endemic and invade the place.
I have always used a paste/gel called Ant Bait and once I find a nest, I put a ring of the gel around the hole which forces the ants to walk through it because otherwise they seem to ignore it but this way, they take it into the nest and usually after 2 days, no more ants.
I would think Borax mixed with anything, better if its sticky, should work.
For Mice I have mixed plaster of Paris in with Icing sugar and put it in an old soft drink bottle with a hole cut in it and you can see they eat it because of the feet marks.
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