"The non-toxic C02 gas formed by the sublimation of the dry ice will safely and easily eradicate any unwanted terrarium guests or plants."
The trick is that the tank has to be air tight, if the CO2 leaks out somewhere, then it won't work. It's ideal to do it in an aquarium. Then top it off every few hrs. I've heard that it doesn't work on mites, though I don't know how the person did it. I know it works like a charm on millipedes. BTW, the cool thing is that this article has been published in 2 european dart frog journals, once translated into Dutch and 2nd time translated into Sweedish. I thought that was kind of cool