I have used baby horns, baby silks, little butters, and baby mantids to vary of my pygs' diets. My adults have never shown any interest in fruit flies - they're just too small. I don't really like isopods because I had a pyg that shot one on the belly I guess (must have flipped itself over) and the bug then rolled up trapping the tongue so I found the pyg just sitting there with the isopod in its mouth because he couldn't swallow it. I had to gently crush the bug to release his tongue. May have just been a one time freak coincidence that it happened that way but I don't use them any more.