While your idea has some potential and it is clearly an interesting one, it has some moral an ethical complications. You'll be saving some possible culls now and probably some in the future, but, you'll have to kill many fish you create or receive just because you won't have an outlet for those that don't meet your goals or the criteria of the general public and you'll only have enough space.
I'm not knocking your idea down, judging you or anything but I do hope you take this and other factors into consideration before embarking on a project that so far seems to be monetarily motivated.
Good luck