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[Nikki Harman]

I have a couple of  question and I hope that someone could help me out.   I am having a real hard time being able to tell the females from the males. They are 5 weeks old, how can I tell which is which?   I bought an Ivory colored female yesterday and I want to introduce her to one of my Slate males. I know there has to be some in there lol At this time, my pups are still in a 10 gallon tank with their mother and father  and the new one is in a cage and there is no way that I can split the cage off. So what I am wondering is how can I introduce my male with my female in this situation? When I introduced my other 2 pairs, I just put them together (which at the time I didn't know any better) and the same day they started mating.   Any help with these questions would be greatly appreciated.   Nikki Harman