I don't get all of the opinionated, damning, responses on forums like this. The betta fry will be fine in the 2 gallon tank and the man is going to do regular water changes to deal with the growth stunt hormone so what is the problem? Flyby you've got the cover needed in the 2 gal, you know what you're doing for water changes, you should be good to go to get a little guy. And hurry up so we can raise 2 baby betta's at the same time and compare notes :p
Pardon me - didn't expect a response like that - you guys seem to know best.