Jake said:
Bioload, If I am going to have a aquarium I would like to have a aquarium not a science experiment. If I do not want them to breed then why get a male?
A lot of times, if people don't want to breed fish, they get all males since they are usually more colorful, but all females will do as well. Just, sometimes, they come from the store pg and you may get a few batches of fry since they can hold sperm a while. But, the other fish will eat the fry so it doesn't have to be a problem.
As for the other thing you said, ... too bad, dude, an aquarium IS a science experiment by its very nature -- a little enclosed environment.
Sorry to be the one to break it to ya. *twirlysmi Overcrowd any environment, even human, and you get outbreaks of disease, excessive aggression, and other problems that work to bring the population back to a more balanced level... but in an artificial environment like an aquarium, the end result can be a total wipeout if the keeper doesn't keep a close eye on the situation and study up on how to handle it.