I have some in my pond that I think came in with minnows. I have enough predator fish in my pond that they can't get out of control. What I'd like to know is why they are so expensive to buy from dealers? Supposedly, they can eat close to their weight in mosquito larve every day... But I've heard the same about FHM. The only difference in behaviour between the two (that I can see) is that the Gambusia are a lot quicker and split up when they are attacked (they don't try to ball up).
Anybody else have any observations???
