I would say you could probably have 2 pairs in it which would be 4 rams. 2 males and 2 females
Well i am not a ram expert but i have done a lot of reasearch on these fish (5 hours straight) since i am planning to get some myself. I would suggest you to get 1 male and 3 females. I forgot what u call this this, but u shud have 1 male and 2-3 females. This is what almost every site has said to me when u google it. Just a suggestion. Hopefully it will be useful to you.
If thats what all the sites say, I'd call them BAD

sites, Blue rams (Mikrogeophagus Ramerzi ) are VERY monogomous. Apistogramma are poligomous, while Rams are not.
Dwarf Cichlids: A Handbook for Their Identification, Care, and Breeding (American Cichlids) by Horst Linke, Wolfgang Staeck -a bit older (misses many more recent apistogramma, but all information on fish it does include is accurate) but still excellent.
Baensch/Mergus Cichlid Atlas, Vol. 1 by Uwe Romer, more up to date, much more expensive, a second edition should be due out next year
These are both excellent books and the price on amazon for high quality 2nd hand copies of "Dwarf Cichlids" makes it a must have if you like rams, apistos etc.
Sorry for the rant, but had to correct it as soon as I saw it
Andrew
it is recommended for determined breeders to get one male and several females for the male to select from. the "less desirable" females are then removed from the tank.
I'd disagree pica, in my personal experience females can be even more picky than males, just depends on the individual fish, so idealy 2male/2female (or more if room allowed) would be ideal, hopefully with all fish pairing off.
Andrew