Ah, sounds good! What if I got a 10-20 gallon and put a divider in it? Think the bettas could kind of coexist that way?

Also, what would be your opinion on a plecostomus being in a tank with a betta? Squeesh, our pleco, is in the tank with the betta we have now. They don't bother each other, they seem rather fond of each other, actually. If I had Feesh and Squeesh on one side then I am, hopefully, assuming that I could have another pleco with the new betta, right? Thank you so much!