Butterfly cages are basically net cages. I'd say about 3-4 can be hatched in a 10 gallon. I don't usually let them cannibalize down to ten, but keep the "toughies" that are active, hunting, and vigorous at L3.
You can hatch as many as you want in whatever cage you want. I prefer one at a time. I don't think you realize how many nymphs come from one good sized ooth. As far as the stages go, when they molt for the first time that is L2 and so on. You just need to get some ideas and then figure out what works for you.
I read 50-200 nymphs can come from one ooth, but it seems the most cost effective way to get these egg cases is 6 for 10$. I'll have to figure out some caging methods. Thanks for the help guys, i'll try to think up some more questions.
May be cost effective however they're so cheap anyways. You will be wasting your time even attempting to hatch and raise six ooths. One is more than enough unless you want to put the rest of them in your garden.
I figured as much, I was going to stick with two and give the rest away to my friends.
Keep in mind many will die. You will be lucky to end up with even 10 adults when it is all said and done. Do not let that discourage you from the hobby. It is normal.
I think that is because we take advantage of the many and i seem to let them kill because i dont have room for over 200 containers. LOL that would be a disaster. But when a more exotic ooth will hatch far less than that and they are more expensive
Nah...
For ones like flower mantises, etc, where the hatch is around 20, have you ever heard of mass "die-offs" like you hear with Chinese or European? They seem to just die without any reason. Also, I have kept all my flower mantises despite the higher cost compared to the common species, and many of them survive. Whereas all my Europeans are dead. -.-" They were my first species. 
