Can I put more rams in my tank?

[panchovilla1133]

I have a 29 gal tank. At this time I have 2 German Blue Rams in there and they seem to be doing vary well. I am 90 percent sure that they are both female. I would like to add two more to the tank, a male and female. I was also thinking about adding two Electric Blue Rams, but have read that they don't do well with other types of rams. Is this a bad idea?
right now this is what I have in the tank.
3 neon tetra
3 julii corys
3 otto cats (maybe less, haven't seen them for a while)
1 rainbow shark
2 German blue rams
the shark and the rams do fight a little but it doesn't seem like a big deal.
I want to add more plants first so it will be a while before I add more fish.