Bacteria do not eat anything in the same sense we do, they do not have a digestive tract. They absorb nutrients from the surrounding environment. Amoeba are many times the size of even the largest bacteria and are active predators. Bacteria are passive, yes they will migrate or may be attracted to a particular nutrient source or an “attracting signal/chemical”, but are not active predators. Amoeba that die certainly can act as a food source for bacteria and there may be some bacteria that secrete chemicals that may cause amoeba to die, but the use of a bacterial agent to control the amoeba on such a large scale is not likely to be productive or environmentally responsible.

As noted in several posts, chemical and/or simple changes in the water environment are more likely to be effective. Avoiding the water until environmental changes check the abundance of the amoeba seems a more reasonable and responsible approach.

Pete