Well, no, they fry wont' last in a community tank if you managed to even breed them in one.
Male and female betta should never be put together except to breed them...and as soon as they are done doing thier thing....momma comes out. Dad will care for the eggs and fry until they start free swimming..than all bets are off and he'll eat them if they can't hide somewhere.
I had a tank full of over 200 betta fry once...my first betta breeding experience...for 6 months of my life all I knew was cleaning fish cups and feeding fry....! It was fun and intersting I suppose...but not something I want to do again unless I have a properly setup betta barracks system...since my family didn't really appreciate my obsession....lol...