My worm bin also has BSF grubs in it. I counted 25 just on the surface tonight. My bin is a rubbermaid container about one foot by two and a half filled with paper, a little dirt and some kitchen waste. Its about one month old. If I had not read this topic I would have never known they were not just some nasty maggot. My wife has decided to let me keep my worm bin in the garage after I showed her this post after she saw them when dumping coffee grounds into the bin. Once again this site amazes me with knowledge on it. Thanks GW