As some of you know I just got my O's yesterday. All is well, except the smaller of the two is really bullying the other. The tiger will slowly go to the side of the tank where my albino is and then nip at it and chase it away. Then they just switch sides. Surely this isnt a territory thing because they have just been here a day!

How big/old are they? what are your water peramitors?

You often get one fish that is more domineering than the others. Sometimes it doesn't cause any problems, other times they can be quite a lot of aggression which results in injuries. You just have to keep an eye on them and see how things go.