The more protein the have, the better-looking fish.
However, you are right, bloodworms and blackworms can be fed excessively for a fish and it can be dangerous to its long term health.
Most of my fish only get bloodworms and blackworms once a week, but you should be feeding flake food (IF you feed flake food ) that has a good percentage of protein.
I have no idea for the exact percentage but usually it does not hurt to have a high level of protein in dried food. It should be around I guess around 40% is the average guppy specialized food percentage.
I tested 97% positive for Multiple Tank Syndrome
King of the Virtual [Cory] Catfish