As I said before, not all insects are good for fish....some worms such as red wigglers may not good for some fishes. I had some fish that rejected red wigglers but have no problems with accepting nightcrawlers. Same with centipedes, my fish won't touch them.I have fed my fish hundreds if not thousands of bugs including crickets, centipedes, june bugs, worms, moths, and just about anything else I can find in the yard and house for years and have never had a problem. On the other hand I have had 2 mass die offs after I have fed them feeder goldfish from the store so I have stopped that. If they are into raising fish try getting them onto cons or mollies. This way you can have a supply of clean feeders, and they can feel like they are helping you. This would be a win for everyone and save you some cash.
All natives (sunfish, walleye, bass, perch, bowfin and bullhead) as well as tropical catfish and cichlids, they spit the red wigglers and centipedes out but readily accepted nightcrawlers. Lady beetles, milkweed bugs, ticks and slugs are the ones that my fishes won't touch. If you have fishes that is eating red crawlers or centipedes or any distasteful insects, they are usually starving.
Red wigglers r a fine fish food. The discus my father used to breed on a mass scale only got wigglers and home made high protein fishnfood.