This was something I have wanted to do for some time after seeing a video of some Tetras gobbling them down. A couple months ago I ordered my culture and started. My Aplocheilus lineatus Golden Wonder Killifish love them. They are a surface feeding fish so fruit flies really get their attention. Fry of about one half inch can take these Drosophila melanogaster wingless fruit flies which are only 1/16 inch long. Growth of the fry on these and Grindal worms is excellent. I have never had such nice fish. The only thing that puzzles me is that the fish don't seem to digest them well. When they crap them out it's in a little ball of fly husks that spatters apart into lots of pieces when I siphon them out at water changes. Maybe how when we eat corn and it makes it through. The corn kernel is still there but the juicy pulp filling has been digested out. Sorry to be so graphic but, hey!, we're all scientists here. The flies are easy and fun to raise but they won't hold still long enough for me to give them names.