I grow mine in unventilated cointainers on coco fibre as substrate and feed them bakers yeast. I tried several food types like rice, banana, mashed apple, papaya but they go crazy for bakers yeast. I don't recommend food with cerial grain like rice since they can have mites and ruin your culture. I got my first 2 cultures 3 weeks ago and 1 week after I made my own culture and now there is one huge colony in the container.