Dave,
Gambusia are very tolerant of a wide range of bad water conditions. They are real survivors, and one of the last species swimming when small ponds go bad and/or dry up.
I think gambusia is about the slowest fish in the pond. They survive by hiding, not out swimming predators. I keep hearing they eat eggs, but most beds are in water far too deep and open for them to venture into. If they even come close to LMB or BG beds, they are instant fish food.
