I know doviis are piscivores but mine did the same thing, he always killed the feeders but never ate them. I broke his hunger strike with blood worms eventually. my dovii was more picky about food then my ball python.
yeah...today was the first time i've seen him eat. he hasn't shown any interest in bloodworms, earthworms, pellets, market shrimp, krill, etc. he only ate one rosey red. it's a start.
since the last post he's definately fattened up. he ate all 6 of the rosey's and 2 small goldfish that same night. (at lights out) he seems to have settled into this setup.