I've heard many different opinions and thought I would get some more before I decide what to do. I wanted to get guppies for my 10 gallon tank and I don't want babies. Males are more colorful so I wanted to get like 4 or 5 males but I've heard they would get aggressive, at the same time I've heard they only get like that if a female is introduced to the tank. So what should I do? All males or not?