I've heard of several people keeping male bettas and german blue rams together.
My idea is for a community tank with several species. I have a 55g tank so the larger size always helps. I was going to introduce a pair of rams first and the betta last to help minimize his territorial aggression.
Betta with any kind of cichlid isn't a good idea. Even in a large tank, I wouldn't do it. Blue rams may be peaceful for a cichlid, but that still isn't a very peaceful fish. I've heard stories of rams fighting and one dieing as a result in tanks larger than 55 gallons. Just keep the betta in a 5 gal.
I agree with Izzy, hah.
I've seen this combo tons of times over, but it's a ticking time bomb. Cichlids and anabantids simply should never be mixed, no angel fish and betta, no rams and betta. These are two fish that both want to dominate the tank.
Rams really do seem one of the sweethearts of the cichlid world, but even a lone ram can become aggressive if it decides it's ready to mate (doesn't need a partner in the tank to think this).
Blue rams are also quite a sensitive fish, so if you're still interested in them, research well. They need warm waters (over 80F) with some dither fish that can handle those temperatures. The similar Bolivian ram is a much hardier fish. Posted via Mobile Device
I had 2 blue rams with 3 female bettas in my 15G. I was being really careful about it and monitored them everyday but eventually the rams were killed by my 3 females. This happened not to long ago.... but like the others have said. You can always try it.