Separating a clown from it's anemone?

[tony_3a]

i know im new and all but this is one thing i had no problem with, i upgraded my tank i bought originally(way to small) and my green bubble tip that my clowns were hosting died in the move, and that was about a month ago, my clowns were fine and didnt get aggressive at all then about a week ago i put a purple tip in and the next day they were hosting the purple tip anemone.