I want to know how to tell what sex BPs I have.Ive also searched about them breeding and theres a few different opinions.I just got these 2 for free with the tank and when I got home and re set it up one started digging a whole,like for eggs I thought.If I can find out what sex they are that would help me out,and if they really are always sterile what do I breed with?Any help with these 2 would be great,actually any info you guys have will be great!!!