Allowing fish to constantly fight and stress each other out isnt exactly what i would call A1 fish care, you can keep the cleanest aquarium in the world but if your fish dont get on then there is still going to be deaths and diseases.
It has been noticed that time after time threads have been made saying about how "this fish got battered by this fish" or "my such and such killed my diddly watsit" and to be quite frank about it we the moderators are not happy with it as it sets bad examples to newer and more impressionable fishkeepers.
I'm locking this topic now before things start getting more heated.