in adition to the bloodworms mentioned above, you can give your fish saltwater seafood, any vegetable they will eat, and any fruit thy will eat, preferably atleast 1-2 times per week. This will give a much better diet that your parots will enjoy much more than any prepared food.
Also: any freze dried or sterilized frozen food can be given as well, but fresh foods like the ones mentioned above will give a better nutritional value.
Please note: blood parots are mutant fish wich can't close thier mouth, wich is why some people don't like them. This most likely gets in the way of feeding certain foods wich the two original species would have no problem eating.