You should really start your own thread when you have questions relating to something different then the topic..
As for answering you... get them separated NOW!
Males and females should never be put together.. by the end of the week you will have a dead fish, and most likely it will be the boy. They are not meant to be together, males and females. Males don't go with other males either. They may not be fighting now, but they will fight, trust me. They are still just adjusting to their new home, reason they haven't fought.. but once they get comfortable and want to establish territory (which will be soon), they will fight, and to the death.. so please, get a second tank or divide that tank (if it's 5gals +) before you end up killing one or both.. I can't stress that enough.
As far as bubble nests, they make them on their own for different reasons whether it be territory, the weather, breeding, etc. You can't force them to make them.
If you want more answers, post this in fish care section of the forums where you will get more people to see it..