Wow.. I sure hope you are in high school because it sure seems like it. If not then wow.
I asked you questions in the beginning because if you are asking how many to a tank there are things to consider. Sex, age, whether you are breeding or not etc.
Also when you are saying if it "happens it happens then" it just sounds like you are not really knowledgeable about breeding of cresties, which you clearly are not, therefore I am going to respond questioning that as most people who have knowledge with breeding would.
I'm done here because clearly you don't care to learn.