Years ago I was working on a mostly self sustaining enclosure for D.auratus and D. leucomelas. I was able to maintain a steady supply of meal moths, Pyralis farinalis, by maintaining a small pile of "deer corn" inside a hollow log inside the enclosure. It worked extremely well as those particular darts would catch both the adult moths and the larvae but were unable to exterminate them. I tried the indian meal moth, Plodia interpunctella, as well but it was consistently out competed and did not seem to do nearly as well in a humid environment. The main "problem" I had with it was occasional escapes of a few moths and a large number of some type of small house spider that kept invading the tanks to get at the moths. They would then breed in there and the tank kept getting overun with hundreds of tiny spiders. The frogs ate some of the spiders just as they ate the moths but the spiderwebs filled with dead moths were unsightly so I broke the tank down after a few years. It was quite functional though and produced fat healthy looking frogs that I never needed to feed. The darts would spend hours sitting on top of the mound of corn waiting for moth larvae to come to the surface. That ambush type of hunting was interesting to observe.