When I received my Cephalotus a year ago after it settled in and it was still winter, I fed them wingless fruit flies. However, now, my Cephalotus is in a windowsill and no longer under fluorescent lights. The only visitors that come inside for a taste of nectar are bees and they don't fit in the pitcher. A bee did try and shove itself in one of the smaller Cephalotus pitchers and got stuck, and it kicked and buzzed for a whole hour before I finally just got a tweezers, grabbed it and flushed it down the toilet. I go outside every once and awhile, go down my driveway a bit, pick up a few ants, small to medium sized, not any of those gigantic ones, just a few typical worker ants, and put them in the pitchers, One a pitcher usually, sometimes 2. My plant has been going mad with the pitcher production. It started off with 4 pitchers and once those opened it started pushing out another five, and it's still making more, as well as flowering, so, I decided to feed it some ants for a bit of a well-deserved (and needed, I'd guess!) boost. I also fertilized my Cephalotus on one occasion. I gave the pitchers a light misting of 1/2 of the manufacturers recommendation of an orchid fertilizer. My Stylidium took off like mad, and my Cephalotus showed improved growth speeds as it would with a few bugs, nothing spectacular. All in all, ants are the best choice. I sometimes be cruel and let nature do it's own work by putting the ants on the Cephalotus. Some are frantic and try to escape (in which case I hold onto them and watch the curious ones fall in) and then at the end feed the frantic ones to the plant.