Black fly larvae

Not sure about corn meal but I've kept them without food until they turn to flies but it's better to gut load them of course so I've also used bananas which they loved. They just dont smell the best.
 
They're great composters and will eat near about anything. The reason we feed BSFL is for variety and their high calcium rate. I don't gutload mine at all, they tend to get stinky if you do that. I feed them off, let them turn to flies then feed off for enrichment, and always add a few extra to my compost bin to help with composting.
 
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