GW I have thousands of grubs in my bin and it is doing very well. I have the Bio pod it is doing very well. Every time I add veggies to the pod I like to keep an eye on it for about 2 days. There are always a ton of house flies in it hanging around. I will take the lid off to take a peak in side and there would be about 30-50 house flies hanging out in there. there are some house fly larvae in the pod but I can only see about under 75. I am not too worried because my colony is huge and doing very good. I am just confused about why I have so many house flies.