Haha, whomever told you that you could only have 4 rams in a 65g is crazy. The general rule of thumb per cichlids is 1 inch per 2 gallons. If we assume that each ram is 4 inches, you could fit 14 or so in there. I would hesitate to say that you could place 16 rams in there
wow, that sounds like a LOT. I've never read numbers anywhere near that in relation to the tank size and dwarf cichlids. Have you attempted this yourself?
I've limited myself to 6 bolivians in 80g (with other fish, obviously) because everything I had read seemed to say that was pretty much the limit.