Oh my! I don't think a 2 foot anything should be in a fish tank! :P That would terrify me, it'd be like a little shark! I don't really like sharks. I think they are amazing, but scary.
And no way would I put a female betta with a male! I know apparantly know nothing about cute little catfish, but I know lots about bettas. I would keep her in a 1/2 gallon starter tank until I could get her something bigger... but I have all of the supplies she would need, and it would be loads better than the cup, right?
Ah, poor Benny! Well, he is exploring right now, and sniffling with his whiskers for some fallen food. I hope he found some! Butterfly is following him around and copying him now. He's only nipped him once more. Poor guy has to be returned now. :(