I'm looking to upgrade the 2 gallon tank but the problem is I have no room and my dad doesn't want anymore tanks, because I have 4 in my room at the moment, but the bettas have been fine together for about 6 months now, but I'll keep my eye out for any trouble and if worse comes to worse I'll put them in their betta condos, but those aren't that big. I have no idea what happend to my friends bettas, my one friend who had the 3 die on her didn't even have them for a month, but I never saw them in their tank so I don't know what happend, and the other friend who lost the 2 females did so within at least a month or two I think because the male was chasing them around and stressed them out but I'm not totally sure, mine very rarely chase each other around and then like I was saying sometimes the male flares out at the females to get under the rock and then other times I'll see all 3 in the rock together. It also seems that they tend to stay in their own sections, the one female likes the top, the other one the bottom and then the male is more of a middle swimmer.