I have one huge goldfish, Sunset Platies, Mosquito Fish, and another tiny one I can't ever remember the name for. All have been happy together for more than a year, but then the pond used to be my swimming pool so there is lots of room -- about 22,000 gallons. I have noticed lately there seem to be a lot fewer of the small fry than the original hundreds I started with. Could be why Red [the goldie] is so huge!
JulieB