I added some Gams to my pond as well then read they were an issue and would take over any native species. Well considering the fish in my pond the FHM did not have a chance anyway.
Plus I have not seen and Gams since the hard winter we had a few years ago, maybe the -31 temps killed them or they were just eaten. I hade a couple of black striped top minnows as well but they are gone as well. At least I was able to enjoy watching them for one summer.
They are a neat fish to have in a tank as well, my daughter would feed it and have it trained to jump out of the water and nip her finger (or at least she thought she had trained it and I could not bare to tell her else wise).
