If you stock FHM and they do not have time to reproduce and if they don't have a lot of cover, then they will be expensive fish food. If speed is your goal, maybe feed heavy? I originally stocked my first pond based on a recommendation from a large hatchery. It was OK, but designed to sell fish, not produce the best pond results. I had a prolonged period of snow over Ice a few years later which has let me re-balance things. Some things just take time. You can add the FHM before the pond is full. That is what I did in my third fish pond last fall after I built it and it partially filled - just added 1 lb because it had so little water (1/2 acre when it fills). When I started, I just wanted everything done. Now I really enjoy the process of getting there (and learning). Still working on the 2nd pond built in 2014 to hopefully get a fun SMB/YP pond. Most of all, have fun!