I love my mosquito fish! They swim into my hands and I can actually pick them
up. I think they're really cute and fun to watch. They probably would go
downstream into the main pond though. Wouldn't hurt to try.

(3) If I put mosquito fish (which I've heard are almost as much of a
nuisance as mosquitos) in the upper pools, will they just end up in the
main
pond, and not solve my problem?