In a 1/10th of an acre pond, a few dozen RES and ONE LMB could work. That lone LMB should be able to control all offspring the RES would produce. Or, instead of the LMB, you could consider a small and I mean small number of CC. Perhaps 5 or so... I think HSB would probably struggle without supplemental feed, no aeration and a pond so small. If you are confident in your ability to ID males from females, an all male BG pond would be an excellent idea as well...