I've been raising composting red worms in my shop (stat set to 50F in winter) for the last couple years doing some Vermicomposting experiments. I bought ~2 thousand worms from a local guy but it appears they're also available online. Very easy to setup:
https://www.youtube.com/watch?...
I give the worms veg scraps (sometimes whipped into a slurry shake), egg shells, coffee grounds and also a mix of flour, corn meal and ground oats feeding them about once per week.
I've been populating 5 gallon buckets with some worms creating worm tower compost bins (free range worms) per videos like this one:
https://www.youtube.com/watch?...
This has been a convenient way to 3-season compost but I'll be building a larger outside compost bin this season. I've been moving the compost/worm castings from the towers to enrich the soil during Spring planting then restarting the bin using captive worms. I don't know if the worm guys survive our relatively mild winters or not. Hence the handful catch & release.
I just made a 1/4" screen sifter to harvest castings for the 1st time as an amendment to my new greenhouse soil. I couldn't find 1/8" hardware cloth in a small amount so ended up buying a gold pan sifter which some folks say they've used to separate the worm eggs from the castings. I'm giving this harvest a go today using the bright light technique to make the worms seek darkness lower down in the bins (light up the tote, wait 20 minutes for the worms to head down, scrape the top layer, sift and repeat). Seems reasonable...
https://www.amazon.com/dp/B008B0TJAI/
The worms make great pets as they never complain and don't require much ongoing effort. They happily stay in the totes but it is important to keep them fed as I had a worm riot one time when I forgot their meal. Fortunately they stayed inside the tote. Garden on..