Red zebra woth cobalt blue??

[ScottBrass]

Hi there! First timer here so my apologies if I posted in the wrong thread or somebody has already asked this.

I currently have one female red zebra cichlid and I’ve been considering adding one or two more red zebra’s and a cobalt blue. I’ve got a good enough tank setup, my only question is regarding their sex. I know I should have one male and 2-3 females, should the cobalt blue be the male? Or one of the new red zebras? Also yes I know they should not breed and make hybrids dont worry

[Kingston1]

1) How do you know the Red Zebra is a female? 
2) in Zebras, you should have 4-5 females per male.
3) If you are not going to keep or raise the babies (fry), then it does not matter which male or female you get. 
4-5 total females per male. 

[cscott1]

I agree to an extent with Kingston with the exception that male on male aggression is normally more extreme than male on female.