they wont be your babies in the tank forever!
i have grown carp from fry, to a weighed 2lb in just one year!
and thats just in a 3ft tank.
have done it for several years to get some of "home grown" mirrors in our lake. lots to learn... just be careful not to kill them.
great to watch, see them reacting to bait, etc.
you have to be real careful to maintain some decent water quality.
good luck...