I currently have 5 angels in my 75 which has a similar footprint, and they are fine together. Two have paired off, but the tank is larger so they don't bother the other ones very much. I believe my other three are females. It really depends on your fish though. Mine have been together for almost a year with no problems, but that doesn't mean that one day I won't have to separate them. You never know. I would get a group of about 6 juvies, let them grow up together and see what happens. Having a heavily planted tank also helps because it breaks up the territories.