The Betta and the frogs have been getting along great for 2 or three months both in this aquarium and their previous home. I'm not sure about the crab though. Now that I think about it, forget that I ever mensioned putting a crab in my tank! I mustn't have been thinking properly.
I like the zen look. My Bettas didn't get along so they have their own aquariums now. I thought that females were supposed to get along even though the males don't. Yours seem to be doing fine though, what's the secret?
That's why, I only had two. The VT was always beating up on the CT. I thought they would get used to each other but after two days I ended up separating them. She pretty much just chased the other one whenever she was in sight.
Alot of decor and hiding places help break up aggression but even then, I am not sure why mine get along so well, especially considering one of the females turned out to be a very young, mislabled male. Yes, he is still in there and yes I know males/females aren't supposed to live together but thay have lived together for about a year now and never have I seen any real aggression from any of them. He flares and sometimes chases that's about it.
Even with 4 or more females, there is no guarantee they will get along. Some are just too aggressive. I had one girl like that.