Hello Josh,
first of all you should be aware, that no matter how widely used, dog food or cat food, or any food containing fats of warmblooded animals is really wrong. The reason is simple, these fats are not apropriate for fish. Fish need fats that are liquid within their range of temperature and those that contain the right forms of fat useful for their organism. For this reason, white worms and grindal worms are known to have to much fat and are used only sparingly by experienced aquarists. The “too much fat” thing is not actually the problem, the problem is too much of bad fats as since people started to use them , they were cultivated on food contaning milk fat (oats and milk was the first food used for these). In fact you can prepare high quality food yourself using instant oat flour and skimmed (no fat) dried milk powder in 3:1 (w/w) ratio. Either use it as powder or add a little water to form little drops, so that you are able to remove these and add fresh food on regular basis. You need to the worms to have quality nutrition, as the substances they contain is what you feed to your fish. I can post some more complex formulas for food cultivation later, but this one is way better for the fish and easy to prepare.