im not clued up by an means as im only just starting out with betta but...
How I will set my betta up, is my main betta(I have 2 breeding males) will each have thier own tank, which are 400 X 400 pretty much, planted, substrate, heater and spongefilter so they have a nice home.
The offsping males I am not keeping will be jarred/hung in my other tanks until ready to go to there new homes so it won't be a perminent thing here, but may end up being jarred in thier new home anyway as I am a small betta breeder and only currently have 2 boys.....
I don't "like" having to keep them in jars etc, but for alot of people they can't actually have a tank for each male betta, especially if you have say 400 fry, 250 or more of those are male! Lol....