I have been successfully culturing from the original batches Micro Worms and Walter Worms almost 4 years now. The Micro worms are the easiest fry food to maintain imo. The batches can last for 1 month before starting new ones. The only downside side is the smell from the container when open it. I personally keep my Micro worms in my basement which stays cool year round. They are excellent for fry that stay on or near the bottom. Baby brine is still probably the best but members can always have Micro worms available as instant food source.