I bought two female hamsters from the petshop. They started fighting after 2-3 days I brought them home. Any idea why are they behaving this way? They can't be fighting for food or place as there are plenty of food and the cage is huge enough.

But the reason i bought two hammies is so that they won't feel lonely. I've separated them, and I feel sad to see them playing and running by themselves. Even if I put them together after bath, they start fighting again.. ish. But i think separating them is the best way, though.