BettaNewbie: I'm up to five, and probably won't be stopping hahaha. So glad you've got the bug, too! :D
KJWarren: I keep all my kids in separate containers: 1 in a 10 gallon (my first boy), 2 each in a 3 gallon (one hex, one cylinder), and my 2 baby girls are currently in 1 gallon quarantine containers, but I will be attempting to let them live in a 20 gallon long. Since females can sometimes be housed together, I'm going to try with no divider and a school of tetras, but if the girls start trouble, I'll probably move them.