I already had three male Guppies in my tank. Got them two weeks ago. So now decided it was OK to add 2 more fish and settled on 2 male Swordtails. The Guppies were fascinated, even when I was acclimatising the bag they kept trying to get to the Swordtails. Once I let them out of the bag, the Guppies just kept mobbing the Swordtails. I've watched very closely and I can't see any nibbling of fins going on, but there is a lot of body barging. Most of the time the Swordtails don't seem too bothered, but every now and then it must just get too much for them as they make a sudden dash across the tank. But the Guppies are in hot pursuit and just continue their pushing and barging. Is this something that will settle down in time?