I normally just rotate what I feed my fish everyday..... My goldfish get some flake food one day, and then some little pellets the next, and then some peas the next (they love those) and so on. My betta gets bloodworms, tropical flakes, or little betta balls.... and then my guppies get either these little sinking pellets, or flake food, or some peas. They like it, it gives them something different to go after. So I would say if you combine blood worms and pellets in one meal, only do like bloodworms the next day, and then the day after that just do pellets. Switch it up a little! Good luck!