Thumbs Up and Fins Up to you for your Betta-Rescue and Rehabilitation plan
BUT ... Please be careful if you are going to sell them or give them away afterwards. The people who take them might not treat them well .... they might not know the best way to take care of Bettas.
I wish I could have a SUPER BIG FISH ROOM in my house so I could rescue and keep as many pet-store Bettas as I could.
Good Luck with your rescue plan ... hope all goes well
PS>>>>If you sell any of them, you should be sure to include BETTAFISH.COM as part of the information you give them