Glad this subject came up. I don't need a lot of FF, so I made up a large cereal container of mix which I have had for about a year making up one culture every two weeks or so. ( A half a cup goes a long way.) Flour beetles began to accumulate and since I use boiling water, I didn't think they were a problem. However, the last two cultures are not doing too well. The first I may have used too much water.. all the seeding FF died. I added more FF and they too died. I scooped most of the top layer off of the cereal container (which had clumped some and contained most of the beetles) and made a new culture. It is doing okay. I think if you have the room in your freezer, it would be a good idea to freeze it unless you use it in a few weeks.