Dave Thank you for your advice Yes I do like to mix them up a bit. It's more interesting but I wont do it if it hurt other fish or that it gets constant harassment. I'll see if I could give away the betta.Nephen lovely person that you are I'd like to make a gift of this to you , it seems as you are constantly having problems with species compatability please download this it will help you imensely in the future so you wont mix the wrong species :-
http://www.liveaquaria.com/general/fwcompatibility_chart.cfm
Hope this helps you
Dave