Clam hosting clowns?

My Derasa clam is allowing my false percs to chill in it from time to time. I am worried the clam may think twice and close on the fish?

Think that is a concern or will the clowns be quicker than the clam?

I have had the clowns 8 months and the clam 4, just noticed this behavior though. I do plan to add an anemone after I move the tank next month(afraid to add one sooner and harm it with a tank move)
 
I can share my experience I have two clowns and two clams for over a year each host one of the clams. I also have a bubble tip but the clowns prefer the clams... They host it day and night at time motionless laying in the clams mantle. Clam has never as much as flinched with them in it. I've wondered the same about them getting squished but so far so good.
 
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