Ponds can have high density invertebrate populations similar to those of Bruce's pond, one just has to follow his example. A few FHM is difficult to produce in a pond that does not have bass or some sort of small predator. I doubt a pond with just a normal BG population will result in a few FHM. FHM reproduction will almost always outpace BG predation. Does anyone out there have just FHM and BG in their pond? If so how, is the balance of numbers?