I have 5 fish and they are in good shape. I have read the pervious things on chasing but this is not the season for breeding so are my fish just having fun? They do not seem to single out one fish. They all chase around at each other at different times. Some do chase more then others. The one copper one seems to be somewhat aggressive towards the black(green) one by twirling and circling together at times also it pushes sometimes. Mostly they just get in a train of chasing. Thanks fishfun
What kinda fish have you got? What's the size of the tank? Water conditions?
It could be that the fish aren't compatible with each other so therefore trying to establish dominance, or it could also be that your tank is overstocked and they are squabbling for territory.
or it really could be that they are purely playing. But without knowing what kind of fish, and the size and condition of your tank, it's hard to tell.