It's your tank and you may do as you wish. But use caution and understanding. The sole purpose of these critters lives is to reproduce. This cannot be accomplished if you are not the top male or the only female. The "immature males" won't be happy being "immature males" all their lives and will compete till the point of death for a top spot. The female will do her best and prevent any others from becoming female. In an enclosed environment, there aren't any places to completely avoid one another when the attacks start happening. Stress will build, illness will set in. It may be a happy home for awhile, but nature and instict will take it's course.