if you want other large/med CA cichlids then you would have to get rid of the geos and yeah i dont know what pic they showed you but if they are really only 1in than there is no way that they have bred, im not sure when these guys mature as iv never kept geos but i wouldnt think it would be till they reach at least 4-5in, if you get rid of the geos then you could do:
Sev
Tex
Firemouth
and pretty much any other cichlid you wanted that stayed under 16in like
Green Terror, jack Dempsey, Cuban, Red Terror, Salvinis, Argentea, and lots of others
could do 2 of those (single specimens if you want a pair of something then that changes what you could do, def dont do red terror pair unless you want the tank to eventually be just them) and then some kind of dither school and bottom dwellers (bichirs are SWEET could do a delhezi, ornate or senegals, or some kind of smaller catfish) as long as you start them out all small together then your chances of them getting along will be much better, and deco is always key. need to make sure youv got plenty of driftwood and hidy spots for fish to get away from each other and have their own little territories GOOD LUCK