Anything with "worm" in the name should be considered more of a treat than a staple, generally speaking. Back in the 1980's I had a colony of mealworms, primarily started for my pair of African Butterfly fish and my assortment of amphibians (frogs and several newt species). I learned then that mealworms are not staple. I also fed the beetles, the Butterfly fish loved these when one was dropped on the surface; they snapped it up and crunch, crunch...gone. But the beetles are too large for most fish. The frogs liked them.