I only had 3 fish in my pond last year, 2 shuboken's and a comet, and they always swam around together. I have seven in the pond now (3 shuboken's, the comet, a common gold fish and 2 sarassa gold fish), yet the three guys that over wintered together are always swimming together! It is really funny to watch. If one stops, they all stop, wherever one goes the other 2 follow. The newer fish swim all over the place either together or individually, but my original 3 are never separated!
Derrick