clams and bristle-worms

[fresh]

Hi all,

I took the plunge this boxing day and purchased 2 maxima clams. The question for all of you is: I have many bristle worms in the sand and rocks, will they attack my clams from the bottom? How often does this happen? What is the best way to prevent it? place them up top on the rocks or on the bottom on the sand? Which way is safer and better?

Thanks in advance.
Fresh.