What kind of container are you fermenting in? I'm using 1 qt yogurt containers, and was having the same problem. Recently, I've started putting the container in a plastic bag, allowing room for the resulting gas from the fermentation process. I tried using paper towels, but the feed often expanded to get the paper towels wet, then it wicked out all over my counter. (Yucky mess). The plastic works well. If you're using a bucket, perhaps a big plastic bag would do the trick, you just need to remember to burp it occasionally. For what it's worth, the larvae would just be a little more protein.Darn fruit flies are driving me crazy. How do they get through covered feed is beyond me... I am soaking, not fermenting. The maximum amount of time I leave feed sitting is 24 hours. It does start to ferment a little, but not a whole lot. It's usually bubbling, and we have way too many fruitflies to handle.. I think they are fruit flies.. anyway.. GAH!