Tweezers would probably not work, any little tiny peice ripped off of the anemone and left behind will develope into a new majano. And adding a copperband to take care of a single pest is a little extreme IMO. Copperbands are not 100% reef safe either.
Kalk, boiling water, and lemon juice should all work. And I think Joe's Juice may work too. As for the zoos, minimize the contact with the kalk (screens, current, etc.) and they won't be affected.