San Diego Joe wrote:

We are zone 11, I think (I never use that system, but the Sunset Western
garden zones that divide the west into 24 zones). The guy at the store
said they were from a pond near San Diego. He said they weren't "too"
aggressive which I took to mean they won't take your hand off, but maybe I
would need to worry about the smaller goldfish. Tilapia are a variety of
Cichlid, so their aggressive behavior could be anywhere from benign to
piranhaish.

I have a friend with a pair of Tilapia - about 6" - in an aquarium with
breeding Brichardii right now, and those Tilapia are pussies :-) They're
scared to death of the Brichardii ( 3").
--
derek