hmm well they dont fly hence flightless fruit flies...and if you put babies in plasitc bins then that would help from flies escaping , since they shouldnt climb on smooth surfaces....hope this helps
The tubes usually have something for the flies to walk around on and food at the bottom. So yes, they can grow in the container and can/will multiply in the contaciner.
If you sprinkle the needed amount of flies in your cham container/cage, then your babies will be happy. If you put a piece of fruit in the cage, the flies will stay very close to the fruit.
My fruit flies climb right out of anything I put them in. Very quickly too. I use them to feed mantids and if I don't cover the mantids container very quickly a good portion of the flies I poured in will be climbing out.
I have to be honest they wont fly around your house but you will have a few escapees. My husband & I, especially the hubby, couldn't wait until we were done giving my cham them. The rewards for the cham were worth it & it's pretty cool to see him going after them... every entertaining to watch. The couple that might get out through seem cage spaces, such as the door frame, will ussually crawl around the outside of the cage... I would find them & throw them back in there to their death . All kidding aside I think my hubby thought w/ we be infested with them but they die off pretty quickly & probably days after we stopped giving them I never saw one again! Sometimes they will make it to the area where there is water such as your kitchen but not many. Like I already said though when your done giving them they will die off & not be a problem. You should try them... you cham will love them
Are they about the size of pinhead crickets?
You may want to see how these are cultured.
I just did some cultures few minutes ago