Aiptasia On Clam--How Do I Kill It?

[MMAX]

I've never had a problem with aiptasia, don't have a single one in my tank until now. Found a tiny one on the shell of a 2" maxima clam I added a couple of weeks ago. It's in a bad place, seems like when the clam closes it takes the aiptasia with it. Looks like it's probably on the shell but right close to the mantle. How do I get kill of this thing without harming the clam?