male guppies

Question
i have a cycling 55 gallon tank and i was wondering if i were to get all male fancy guppies if they would fight ande if i were to get female mollies and platys if the male guppies would try to breed them. thanks for your time and effort i appreciate it.

Answer
Hello,
It is highly unlikely that the mollies and Guppies would breed with platys.  They are not of the same family.  Guppies, and Mollies could cross breed seeing has they would have no choice, but the fry would be very weak.  They tend to die quickly.  Many are deformed.  They do not make pretty fish.  It is much better to follow the rule, and put in 2-3 females for one male.  
Lynda