Soldier Fly Maggots Leaving the Worm Bin Indoors

I work as a special ed teaching assistant at a high school in Northern Virginia. Last year we purchased a worm bin and 10,000 red wigglers. Over the summer we had to move the bin outdoors to our garden, because the school shut down. I noticed numerous soldier fly larvae after a month or so, but read that they wouldn't hurt the worms and could even be beneficial. But now we have brought the worm bin back indoors for the winter and maggots have begun leaving the worm bin in droves. The other teachers are not happy! Why are they leaving the bin? Can they be stopped?

Thank you for your advice,


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