I have two cardinals and i am hoping to breed them. I got them as juveniles so my question is: how long does it take for you cardinals to reach sexual maturity? Also, i have two cardinals only in my tank with a couple other fish. my cardinals are always together, at night and during the day. I don't know know their sexes. i know males will fight, and mine do great with each other. so i'm between male/female or female/female. my second question is: if the only cardinals in my tank are both females, would they stay close together like a breeding pair? I want to find out if i have different sexes so they can mate. Thanks for any help.