I don't know much about dumerils, but with balls and red tails if you don't give them long enough to settle in they won't eat. some may take 2 days some may take a week or two. and if they still don't eat, i like to dip the f/t in chicken broth and that works really good with the boas and sometimes balls. like i said though i don't know much about dumerils except that they are some cool boas.good luck with the feeding.