Just curious to what everyones avg lifespan of a blackworm culture is. I change the water every 2-3 days, with aquarium water cooled. And once a week if I remember I throw in a few fish flakes, or yeast. They seem to be multiplying since I keep finding new small worms but I may be wrong. My original 8 oz package seems to me still is 8 oz...And I feed some to my fish 3-4 times a week and to my newts 2-3 times a week.