Well, I will move them from my 10gal to a 17gal in a month and a half (my golds are getting a biiiggg tank)
They should be fine in that tank till month 3, then its time to seperate the aggressive ones. I am building a betta barraks system, basically a long, deep, short tank 'trays' that are divided up to hold 6 to 8 bettas per tray, with 1 to 3/4 gal of water each. I will make about 8 divided tanks - room enough for 64 fish.
The females will be split up betweem my 10gal and 17gal unless I can get my hands on a 33gal in between.
I am going to sell as many as I can directly. I already sold 1 of my adults today (Riker is going to a new home) because I need some more space for my adults. I will likely have give some to family & friends, and I know of a few good private LFS that will take some on credit (NO CHAINS thank you)
I removed Finchy this morning, some of the fry were free swimming. A also dropped some microworms in the tank for food. I think I put a little too much, because the fry are not making a dent yet (lots of wiggleling worms on the botttom of the tank)
Now that dad is gone and they are swimming, they have spread-out quite a bit. It is hard to say how many are alive vs dead. I counted at least 50 on the surface, and there are a lot on the edges of the bottom and in the plants, on the heater, etc...
I am in touch with a local betta breeder, asking her how much to feed, what kinds of food, etc. I just hope I don't mess up to badly and get a good batch to grow.