With non-aquatic insects though, wouldn't there be the risk of introducing something the fish wouldn't encounter in the wild?
Like how we're not supposed to feed mammalian or avian meat because they fish aren't used to the things in it, thus can't break it down.
Would there be a similar thing involved with non-aquatic species of bugs? I realize that bugs often land in the water, but not enough that they become a major part of the fish's diet, like aquatic insects would.
I don't imagine that in the wild, tropical fish consume many Canadian nightcrawlers.

Is it possible that the excess different nutrients, fats, proteins, etc. in non-aquatic insects would be bad for fish since they don't encounter them in the wild?