Anyone who has backyard chickens, needs to make a Blue Soldier Fly bin. We have 1000's of them at the shop. They raise there at will. They even self harvest themselves out of the bin. I'm attaching a video that I haven't watched completely. I know how to grow them. LOL
FYI, you DO NOT have to buy larvae to start your bin. You build the bin, they'll come on their own. Do more YT watching. There are some tricks to getting the adults to lay the eggs where you want them to. Wood blocks stacked close together or something.
These larvae are sold, freeze dried to feed to chickens. They are incredibly simple to raise. They also have more nutrition that any chicken feed you can buy.
https://www.youtube.com/watch?v=KrS-EPo-GQA