Raw oysters on the half shell! once in a blue moon my swarm of assasin (~100) get a treat like that!
I've known a few folks with predator fish who raise the majority of their own feeder livestock (shrimp, fish, worms, etc)--but even they typically will end up buying some foods in the form of fresh veggies, insects, beef heart, etc.I'm wondering if anyone is running a tank with no store bought foods.
Totally off grid would be cool to see...but then I guess they call that a pond.
I do this as well, my angelfish and black neon tetras love them. I have fed house flies and earthworms, spinach, and grindal worms.I feed flightless fruit flies to my rainbow fish and wild type bettas. pretty much any surface feeder goes nuts for them