The bloodworms I beleive just dont digest well.. flowerhorns are so hybridized they have poor digestion... then you get short bodies and bonsai and it's a whole new story... my 2 flowerhorns were a "medium" body and a short body... I never fed them bloodworms much... but it doesnt take much... and what benefit do bloodworms give your flowerhorn... also I have tried over and over again to get my JD off of bloodworms... going as long as 2 months without feeding... will not take pellets... I'm assuming she wont have a very long life not getting any nutrients other than the little bit the bloodworms give her... I've tried everything
That's a big issue if fish stops eating everything else. You can try to get him eating pellets soaked in blood worm juice. Blood worms are high in protein but don't have have all required amino acids and minerals, not so good nutrition wise but okay to be fed occasionally.