Ball anemones?

[Slyguy00]

So my gf bought a bunch of live rock off craigslist and recently discovered it is covered in ball anemones. Until now i knew nothing about these things but the more i look into them the more trouble they sound like. One fish has already disapeared. If possible she would love to avoid removing rocks from the tank as they are all on the bottom rocks (of course) but im sure thats probably gonna be the best route. Does anybody have any experience getting rid of these? Any help would be appreciated. Thanks in advance.