Your fish appear relatively calm right now because they have not yet hit sexual maturity. I keep cons and FMs, and trust me, all hell will break loose once they get bigger, and your rams will be toast.
I agree with JC that Bolivians and GBRs can coexist quite well, however, you shouldn't try it in a 30 hex. These are species that tend to stay almost exclusively in the bottom half of the tank, and the small footprint of the hex tank won't allow them much room to claim territories. I wouldn't try keeping these species together in any tank less than 3 feet long.
I like your idea for keeping the Bolivians in your 30 hex with a school of tetras, although if yours don't pair up they may have some territory issues to sort out. This rarely results in damage, so you should be ok there. Von Rios are a great choice for tankmates. You could do 10 Von Rios and the Bolivians, or 6 Von Rios, the Bolivians, and a very small pleco, like a clown, tiger, or pitbull.
