I 've had 3 fish for about a year now. They have grown to be between 4 and 5 inches long (including tails) and have really put on the weight. They have always gotten along with each other.
About a week ago, I brought a small oranda (2-1/2 inches including tail) home. I noticed one of my fish chasing the new one shortly after I put them together, but it wasn't very long before they seemed to have settled in.
Well, today all three of my big fish keep chasing the new one around. They just won't leave it alone. I also noticed that the three big fish have little white bumps on their gills (tubercles?). The small fish does not.
Do you think that I may have introduced one little female in with three amorous males?
If so, will they stop chasing her eventually? What can I do, short of separating them, to give her some relief?
Thanks...