Bill - that is something we're never likely to know unless we fork over the dough to have the microbe strains specifically IDed by a qualified lab.
There may be several hundred, possibly thousands of microbe species - each feeding on various types of nutrients under a wide variety of environmental conditions.
To theorize that the same microbes which survive and thrive in a septic tank may do the same in a pond environment might be stretching the concept.
You pose a good question, for which I don't have an answer - just my opinion.
