Do not feed Tubifex worms. Do not feed raw chicken, because of salmonella in the chicken. Feed organ meat sparingly, if at all. Shrimp, ocean fish, squid, can be fed occasionally. Feed any commercial food as a side, not a staple.
Commercial foods are too rich to be fed all the time.
More and more people consider feeder fish a low-quality food. Also, feeder fish are usually not very healthy. Better to feed frozen and thawed freshwater fish. However, these foods are relatively fatty and high in protein and should not be fed daily. With the availability of decent dry foods, I can't recommend this anymore, except as a last resort for an animal that won't eat, even after it has been declared healthy by a veterinarian.