Start a red worm farm, it's relatively cheap to get a indoor red worm farm set up and you can buy your worms from uncle johns worm farm, use your left over fruits and veggies scraps for food and you are good to go. Just keep it in a cool place in your house, I keep mine under one of my tanks, you will have thousands of worms in no time and the fish will love them.
I also started a meal worm farm in a 5 gal aquarium and like that I can feed them left over flake food, and such. What the worms eat your fish will eat thru them.
I also started a meal worm farm in a 5 gal aquarium and like that I can feed them left over flake food, and such. What the worms eat your fish will eat thru them.